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Use several for procedures re-quiring repeated dispensing ofdifferent reagents. Unbreakable... resists most chemicals. Dis-assembles in seconds for clean-ing and refilling. All units have8-oz. polyethylene reservoir bot-tle with choice of 1, 2, 3, or 5 mlpolypropylene measuring cham-ber. Price, $4.50 each. May beassorted with other Nalgene Lab-ware for maximum discount. Askyour lab supply dealer, or writeDept.21261,The Nalge Co., Inc.,75 Panorama Creek Drive,Rochester, New York 14625.

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Leader in quality plastic labware since 1949

conf., Illinois Inst. of Technology, Chicago.(E. K. Wolfe, U.S. Arrny Biological Lab-oratories, Fort Detrick, Frederick, Md.)

29-3)1. Applied Meteorology, 6th natl.conf., Los Angeles, Cailif. (B. N. Charles,Booz-Allen Applied Research, 6151 W.Century Blvd., Los Angeles 90045)

29-31. Chemilical Soc., anniversary mtgs.,Oxford, England. (General Secretary,Buirlington HouLse, London W.1 )29-31. Surface-Active Substances, intern.

conf., Berlin. F-ast Germany. (Inst. furFettchemie. Deutsche Akaldemie der Wis-senschilften ztu Berlin. Rudowet ChaLussee5, 1199 Berlin-Adler-shof)

29-31. Svmbolic and Algebraic MIanipu-lation. symnp., Assoc. for Computing Ma-chinery. Waishington, D.C. (J. F. Sarmmet,I.B.N1. ( orp.. 545 Technology Sq.. Cam-hridge, Mass. 02139)

29-1. American Assoc. for Contamiina-tion C'ontrol, 5th annUal technical mtg.,HouLston, Tex. (W. 1. Maloney, The Asso-cilation. 6 Beatcon St., Boston, Mass. )

29-1. Ultraxviolet and X-ray Spectros-copy of Laboratory and AstrophysicalPlasma., conf., Ahingdcon, England. (Inst.of Phvsics alnd the Physics Soc., 47 Bel-gr-ave Sq., Londion S.WI. Fngland)

30. Oral Cancer, 4th symp.. St. Fr.ancisHospital. PoLIghlieepsie. N.Y. (MI. A. En-gelman. E. Acadnixm St.. WappingersFall s, N Y. )30- 1. Ma1agnetohydrodynamics. 7th

symp.. P'rinceton, N.J. (R. G. Jahn. Guig-genheimi Lahoraltories. Forrestal ResearchCenter. Princeton. N.J. 08540)

31-2. Michigan Acad. of Science, Arts,and Letters, Wayne State Univ., Detr-oit.(E. A. Wuinsch. Dept. of Fnglish, Univ. ofMichigann. Ann Arhor)

A.pril

1-2. Aklharnai Acad. of Science. Birnm-inghLm-Southern College. Bii-minghanm.(W. B. D)eVIll. D)ept. of Forestr-y. AuibhlurUniv.. ALhLIrn. Alai.)

1- 2. Arkansas Acad. of Science. I ittleRock. (GC,. E. Templeton. Unis. of Arkain-sas. Fax etteville)

/-I . National SciencXe 'Feaclhers Assoc..New York, N.Y. (R. H. Carleton. 12016th St., NW, Washington. D.C. 20036)1-7. American Acad. of General Prac-

tice, Boston. Mlass. (NI. F. Caihall. VolkerBlvd. .it Blrookside. Kansas Cit', 12. MIo.)

4-6. Atomic Energy Soc. of Japan. an-nuLal mtg.. Toky o. ( N. Mlasrnoto. JapaniAtomic Fncrgxr Research Inst., 1- I Shiba-tamuLIIraI-Cho. M inato-kil. Toks o)

4-6. t,,xobiology, conf.. Ames ResearchCenter. Nloffett Field, Calif. (L etters andScience Extensioni, Unis. of California.Berkeley 9472(0)

4-0. American Assoc. ol Physical An-thropologists. Berkeley, Callif. (F. E. Johns-ton, D)ept. of Anthropology,. Univ. ofP'enns Ivainia. Philalidelphia 19104)

4-7. Federation of European Biochein-ical Soc., 3rd mtg., Walrsasw, Poland. (T.Klopotowski. Polish Biochemical Soc.,Freta 6, Warsaw)

4-7. Adv ances in Water Quality Imu-provement, conuf., Univ. of Texas, AuLstin.(Special lecture Serics, Engineering Lab-oratorics Bld}g. 305, Univ. of Texas. AuLstin787 12)

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sI'Srvitilonl is i1nadeqlllate.E,d ited1 hsb (oli,n (>aro. \I .D..FS.R.C.I. L.ecturer,l Depar1lt-111(uilt of' \eli(cine. St.TIouliao^> IIosl)ital M1edicalSchool. Lond(1oni.

1966 $14.751408 pp.. 120 fig s.

THE WILLIAMS & WILKINS CO.428 EAST PRESTON STREETBALTIMORE, MD. 21202

Publish(ers of Books ozndl Per(iodicalsin Medicine alndl the Alliecd Scientces.

SCIE-NCE. VOL. 1511(18

4-8. International Biological Program,2nd general assembly, Paris, France. (F.W. G. Baker, 2 via Sebenico, Rome, Italy)

4-10. Psychology, 10th inter-Americancongr., Lima, Peru. (Intern. Soc. of Psy-chology, 2104 Meadowbrook Dr., Austin,Tex.)

5-7. Middle East Neurosurgical Soc.,mtg.. Jerusalem, Jordan. (F. S. Haddad,Orient Hospital, Beirut, Lebanon)

5-8. American Assoc. of Anatomists,San Francisco, Calif. (R. T. Woodburne,Dept. of Anatomy, Univ. of Michigan,Ann Arbor 48104)

6-7. Phlebology, 6th intern. mtg., Aix-en-Provence, France. (F. Beurier. 94, cooirsSextius, Aix-en-Provence)

6-8. Electron and Laser Beam Technol-ogy, Univ. of Michigan, Ann Arbor. (G.I. Haddad, Electrical Engineering Dept.,Univ. of Michigan, Ann Arbor)

6-8. Recent Advances in Phytochem-istry, intern. symp., Univ.. of Texas, Atis-tin. (T. J. Mabry, Dept. of Botany, Univ.of Texas, Austin 78712)

6-8. Plant Phenolic Group of NorthAmerica, 6th annual mtg., Austin, Tex.(V. C. Runeckles, Imperial Tobacco Co.,Montreal, P.Q., Canada)

7-8. Southern Sociological Soc., annualmtg., New Orleans, La. (J. J. Honigmann,Dept. of Anthropology, Univ. of NorthCarolina, Chapel Hill)

7-9. Southern Soc. for Philosophy andPsychology, New Orleans, La. (GC. R.Hawkes, U.S. Army Medical R&D Com-mand, Washington, D.C. 20315)

8-9. American Soc. for Artificial In-ternal Organs, Atlantic City, N.J. (B. K.Kusserow, Dept. of Pathology, Univ. ofVermont College of Medicine, Burlington)

8-11. Animal Toxins, intern. svmp., At-lantic City, N.J. (F. E. Russell. Box 323.Los Angeles County General Hospital.1200 N. State St., Los Angeles, Calif.90033)

11-13. Institute of Electrical and Elec-tronics Engineers, Region 3, conv., Atlanta,Ga. (M. D. Price, Dept. 72-14, Zone 400,Lockheed-Georgia Co., Marietta, Ga.)

11-13. Comparative Hemoglobin Struc-ture, intern. symp., Salonika, Greece. (Sec-retary, P.O. Box 201, Salonika)

11-15. Aeronomic Studies of LowerIonosphere, conf., Ottawa, Ont., Canada.(W. Pfister, Air Force Cambridge ResearchLaboratories, Upper Atmosphere PhysicsLaboratory, L. G. Hanscom Field, Bed-ford, Mass.)

11-15. American Assoc. of CerealChemists, New York, N.Y. (R. J. Tarleton,The Association, 1955 University Ave.,St. Paul, Minn. 55104)

11-16. Federation of American Soci-eties for Experimental Biology, 50th an-nual mtg., Atlantic City, N.J. The follow-ing societies will meet in conjunction withthe FASEB; information may be obtainedfrom FASEB, 9650 Rockville Pike, Beth-esda, Maryland 20014:American Physiological SocietyAmerican Soc. of Biological ChemistsAmerican Soc. for Pharmacology and

Experimental TherapeuticsAmerican Soc. for Experimental Pa-

thologyAmerican Inst. of NutritionAmerican Assoc. of Immunologists

25 FEBRUARY 1966

The newest, most versatile version of this famous fraction collector, cur-rently serving scientists in more than a thousand laboratories all over the world,is now available for immediate delivery direct to you from Canalco's plant inRockville, Maryland.

With the Canalco 1205 Fraction Collector, you can have accurate volumetricsiphoning (2, 5, 10 or 20 ml fractions), timed flow (18 seconds to 2 hours) and dropcounting (1 to 400 drops). Interchangeable turntables hold either 150 or 240 testtubes to collect fractions up to either 5 or 20 ml.

Canalco's own factory-trained technical representatives stand ready toassist in installation and guide you in operation at no extra cost. Canalco thus givesyou double assurance of the same dependable, trouble-free performance on whichthis collector has built its unsurpassed reputation for quality and reliability. Atwo-year warranty provides added protection.

For sample collection plus flow analysis,the Canalco 1205 makes an integrated systemwith Canalco's Wide-Track 85 Ultraviolet FlowMonitor. Available in three models-all with trueratio recorders whose charts are as wide as thisfull three-column page-the Wide-Tracks givemore sensitive detection of both proteins andnucleotides, and cost less, than any other flowanalyzers. Options include automatic scale ex-pansion, automatic baseline compensation, exten-sion cables for cold-room use and choice ofcuvette pathlengths. When ordered together, theCanalco 1205 and Wide-Track come with inter-connecting cable for the Wide-Track's eventmarker pen.

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Contact Canalco direct for full details on the Canalco 1205 Frac-tion Collector and Wide-Track Flow Monitor. Write or telephone:

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The B.rinkmann Mark-V Camera can be usedwith all laboratory and research microscopes.Accessories include a 4x5" Graflok Backfor cut film, Polaroid, No. 120 roll film and 35 mm.adaptors. A built-in exposure meter andlow-power stage are optional.

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SCIENCE, VOL. 151

I

SCIENCE BOOKS: A Quarterly ReviewPublished by AAAS since April 1965

An authoritative review and evaluation of new scienceand mathematics books

for elementary school studentsfor secondary school studentsfor students in the first two years of collegefor teachers for adult readers

The reviews are based on critical evaluations by pro-fessional scientists, mathematicians, educators, engineers,members of the medical profession, children's literaturespecialists, and others. Each book is assigned for reviewto a specialist most competent to appraise it.

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Specific ActivityGlycerol-2-C'4 1Imc/mM