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Vol. 97 No. 2 June 1968

National Science Development Board

Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B.,

Officer-in-Charge, Office of Vice Chairman and Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, Ph.D., EditorClare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor

Mauro Garcia, B.S.E., Managing Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Faustino S. Orillo, Ph.D.Antonio Pizarro, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.F.Landa Jocano, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Jose Vera Santos, Ph.D.Gregorio Velasquez, Ph.D.ChemistryAlfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.

NutritionLeon G. Alejo, B.S.Josefina B. Jayme, M.D.Sonia Y. De Leon, Ph.D.Luz U. Oñate, Ph.D.

GeologyArturo Alcaraz, M.S.Cecar B. Ibañez, M.S.Mateo H. Tupaz, Ph.D.Elpidio C. Vera, M.S.

MedicinePaulo C. Campos, M.D.Conrado S. Dayrit, M.D.Rogelio N. Relova, M.D.Victor Valenzuela, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Macario Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Ramon Samaniego, Ph.D.Getulio B. Viado, Ph.D.

ZoologyNelia P. Salazar, M.S.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.

Vol. 97 No. 1 March, 1968National Science Development Board

Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B.,

Officer-in-Charge, Office of Vice Chairman and Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, Ph.D., EditorClare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor

Mauro Garcia, B.S.E., Managing Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Faustino S. Orillo, Ph.D.Antonio Pizarro, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.F.Landa Jocano, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Jose Vera Santos, Ph.D.Gregorio Velasquez, Ph.D.ChemistryAlfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.

NutritionLeon G. Alejo, B.S.Josefina B. Jayme, M.D.Sonia Y. De Leon, Ph.D.Luz U. Oñate, Ph.D.

GeologyArturo Alcaraz, M.S.Cecar B. Ibañez, M.S.Mateo H. Tupaz, Ph.D.Elpidio C. Vera, M.S.

MedicinePaulo C. Campos, M.D.Conrado S. Dayrit, M.D.Rogelio N. Relova, M.D.Victor Valenzuela, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Macario Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Ramon Samaniego, Ph.D.Getulio B. Viado, Ph.D.

ZoologyNelia P. Salazar, M.S.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.

Vol. 96 No. 4 December, 1967National Science Development Board

Juan S. Salcedo, Jr., M.S., M.D.,ChairmanDiminador O. Reyes.,Ll. B., Officer-in-Charge, Office Of Vice Chairman and

Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, Ph.D., EditorIreana R.F. Cruz, A.M., Associate Editor

Mauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition

Sonia Y. De Leon, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.

Nuclear Science

Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.

ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 96 No. 3 September, 1967National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and

Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, Ph.D., EditorIreana R.F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition

Sonia Y. De Leon, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.

Nuclear Science

Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.

ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 96 No. 2 June, 1967National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and

Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, Ph.D., EditorIleana R.F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition

Sonia Y. De Leon, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.

Nuclear Science

Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.

ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 96 No. 1 March, 1967National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanDiminador O. Reyes., Officer-in-Charge, Office Of Vice Chairman and

Executive Director

Members of the Board

Pedro Afable, B.S.C.E. George T. Marcelo, B.S.B.A.Constacio M. Ancheta, Ph.D. Augusto L. Tenmatay, Ph.D.Jose R. Velasco, Ph.D.

National Institute of Science and Technology

Jose R. Velasco Ph.D., CommisionerFlaviano M. Yenko, A.B., B.S., Deputy Commisioner

Agricultural Research CenterVacant

Biological Research CenterLuz Baens-Arcega, M.S.

Director

Food & Nutrition Research CenterConrado R. Pascual, M.D., M.P.H.

Director

Industrial Research CenterFelife Ll. Santillan, B.S.M.E.

Director

Medical Research CenterRogelio N. Relova, M.D.

Director

Tests & Standards LaboratoriesJose P. Planas, B.S., Chem. Eng.

Acting Chief

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Carmen Ll. Intengan, EditorIleana R. F. Cruz, A.M., Associate EditorMauro Garcia, B.S.E., Managing Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Gregorio Velasquez, Ph.D.ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Augusto L. Tenmatay, Ph.D.Food and Nutrition

Sonia Y. De Leon, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineConrado S. Dayrit, M.D.Paulo C. Campos, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Mario O. San Juan, Ph.D.

Nuclear Science

Pedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.

ZoologyLeopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 95 No. 4 December,1966

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 95 No. 3 September,1966

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 95 No. 2 June,1966

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 94 No. 4 December,1965

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 94 No. 3 September,1965

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 94 No. 2 June,1965

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 94 No. 1 March,1965

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 93 No. 4 December,1964

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 93 No. 3 September,1964

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.E. Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 93 No. 2 June,1964

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyCesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 93 No. 1 March,1964

National Science Development Board

Juan S. Salcedo, Jr., M.D.,ChairmanGregorio Y. Zara, D.Sc.,Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Conrado R. Pascual, M.D., M.P.H., Associate EditorMauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Carmen Ll. Intengan, Ph.D.

GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Luz Baens-Arcega, M.S.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.

Vol. 92 No. 4 December,1963

National Science Development Board

Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Mauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.

Carmen Ll. Intengan, Ph.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.

Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D

Vol. 92 No. 3 September,1963

National Science Development Board

Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Mauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.Conrado R. Pascual, M.D.

GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D

.

Vol. 92 No. 2 June ,1963

National Science Development Board

Juan S. Salcedo, Jr., M.D., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Editor

Mauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.

Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.

Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 92 No. 1 March ,1963

National Science Development Board

Paulino J. Garcia, M.D., ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Jose A. Fernandez, M.D. Jose P. Marcelo, M.S.Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Edito

Mauro Garcia, B.S.E., Copy Editor

Contributing Editor

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.

Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.

Agustin F. Umali, B.S. Getulio B. Vialdo, Ph.D.

Vol. 91 No. 4 December ,1962

National Science Development Board

Paulino J. Garcia, M.D., ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, A.B.., B.C., Associate Edito

Mauro Garcia, B.S.E., Copy Editor

Contributing Editors

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.

Carmen Ll. Intengan, Ph.D.Sonia Y. De Leon, Ph.D.Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 91 No. 3 September ,1962

National Science Development Board

Juan S. Salcedo, Jr., M.D., M.S., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, B.A., B.C., Associate Edito

Mauro Garcia, B.S.E., Copy Editor

Contributing Editors

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.

Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.

Agustin F. Umali, B.S.Getulio B. Vialdo, Ph.D.

Vol. 91 No. 1-2 March-June ,1962

National Science Development Board

Juan S. Salcedo, Jr., M.D., M.S., Acting ChairmanGregorio Y. Zara, D.Sc., Acting Vice Chairman

Members of the Board

Isidro Macaspac, M.A. Florencio A. Medina, M.Canuto G. Manuel, D.Sc. Jose J. Mirasol, Ph.D. Jose P. Marcelo, M.S. Enrique T. Virata, Ph.D.Alejandro Roces, M.A.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc., EditorFlaviano M. Yenko, B.A., B.C., Associate Edito

Mauro Garcia, B.S.E., Copy Editor

Contributing Editors

AgricultureAnacleto B. Coronel, D.V.M.Eugenio E. Cruz, M.S.Ricardo T. Marfori, Ph.D. .Dioscoro L. Umali, Ph.D.

AnthropologyAlfredo E. Evangelista, M.A.Robert B. Fox, Ph.D.Marcelino N. Maceda, Ph.D.Arsenio E. Manuel, M.A.

BotanyDemetrio R. Mendoza, M.S.Faustino T. Orillo Ph.D.Jose R. Velasco, Ph.D.Gregorio Velasquez, Ph.D.

ChemistryIgnacio S. Salcedo, Ph.D.Alfredo C. Santos, Ph.D.Bienvenido C. Sison, Ph.D.Augusto L. Tenmatay, Ph.D.

Food and NutritionBernardo Acena, Ph.D.Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.

Conrado R. Pascual, M.D.GeologyJose B. Barcelon, B.S.G.E.Cesar B. Ibañes, M.S.Mateo H. Tupas, Ph.D.Elpidio C. Vera, M.S.

MedicineBenjamin A. Barrera, M.D.Conrado S. Dayrit, M.D.Trinidad P. Pesigan, M.D.Rogelio N. Relova, M.D.

MicrobiologyPotenciano R. Aragon, M.D.Martin S. Celino, M.S.Macario A. Palo, B.S.A.Mario O. San Juan, Ph.D.

Nuclear SciencePedro G. Afable, B.S.C.E.Julian Banzon, Ph.D.Paulo C. Campos, M.D.Jose O. Juliano, Ph.D.

ZoologyHerminio Rabanal, Ph.D.Leopoldo B. Uichanco, D.Sc.

Agustin F. Umali, B.S. Getulio B. Vialdo, Ph.D.Vol. 90 No. 4 December,1961

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Canuto G. Manuel, D.Sc. Juan S. Salsedo, Jr., M.D., M.A. Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D.Florencio A. Medina, M.S. Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc.Editor

Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 90 No. 3 September,1961

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc.Editor

Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 90 No. 2 June,1961

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc.Editor

Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 90 No. 1 March,1961

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Juan S. Salsedo, Jr., M.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc. Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Canuto G. Manuel D.Sc.Editor

Eduardo Quisumbing, Ph.D. Flaviano M. Yenko, B.A., B.C. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.

Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 89 No. 3 September-December,1960

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.

Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 89 No. 2 June,1960

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial Technology

Dionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 89 No. 1 March,1960

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 88 No. 4 December,1959

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 88 No. 3 September,1959

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S. Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.

Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 88 No. 2 June,1959

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.

Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Feliza, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.

Vol. 88 No. 1 March, 1959

National Science Development Board

Paulino J. Garcia, M.D., ChairmanCasimiro del Rosario, Ph.D.

Vice Chairman and Executive Director

Members of the Board

Teodoro Evangelista, LL.B., LL.D. Florencio A. Medina, M.S.Isidro Macaspac, M.A. Jose J. Mirasol, Ph.D.Oscar B. Mapua, B.S.C.E. Crisostomo Ortigas, M.S.M.EJoaquin Marañon, D.Sc. Antonio G. Sison, M.D.Gregorio Y. Zara, D.Sc.

The Philippine Journal of Science

Published quarterly by the National Institute of Science and Technology(Formely Bureau of Science), P.O. Box 774, Manila, Philippines

Joaquin Marañon, D.Sc.Editor

Eduardo Quisumbing, Ph.D. Canuto G. Manuel, D.Sc. Associate Editor Associate Editor

Mauro Garcia, B.S.E.Copy Editor

Contributing Editors

Agriculture Nuclear Science MedicineAnacleto B. Coronel, D.V.M. Pedro G. Afable, B.S.C.E Walfrido de Leon, M.D., D.T.MEugenio E. Cruz, M.S. Julian Banzon, Ph.D. Virgilio Ramos, M.D.Nemesio B. Mendiola, Ph.D. Paulo C. Campos, M.D. Rogelio Relova, M.D.Leopoldo B. Uichanco, D.Sc. Ignacio S. Salcedo, Ph.D. Agerico B.M. Sison, M.D.

Anthropology Food and Nutrition ZoologyH. Otley Beyer, M.A. Bernardo Acena, Ph.D. Leopoldo S. Clemente, Ph.D.Robert B. Fox, Ph.D. Conrado R. Pascual, M.D. Heraclio R. Montalban, M.A.E. Arsenio Manuel M.A. Juan S. Salcedo, Jr., M.D. Deogracias V. Villadodid, Ph.D.Marcelino N. Maceda, Ph.D. Florencio A. Soliven, M.S. Lope M. Yutuc, D.V.M.

Botany GeologyJose M. Capinpin, Ph.D. Antonio D. Alvir, Ph.D.

Tanquilino G. Fajardo, Ph.D. Cesar B. Ibañez, M.S.Macario A. Palo, B.S.A. Elpidio Vera, M.S.Gregorio Velasquez, Ph.D. Mateo T. Tupas, Ph.D.

Chemistry Industrial TechnologyDionisio Birosel, Ph.D. Manuel I. Felizardo, B.S.M.E.Aurelio O. Cruz, Phar. Chem. Gil O. Opiana, B.S.A., Chem. Eng.Marcos M. Alicante, Ph.D. Mariano P. Ramiro, Ph.D.Patrocinio Valenzuela, Ph.D. Anastacio L. Teodoro, Ph.D.