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loD, TEkrS -sgis d-u-p laboratory chores t10 Volts AC- DC _ 25 Wats nlKlOfl paraffin knife makes work with paraffin-embedded tissues quick and easy. Great for cutting, large blocks iuto small ones; for mounting blocks on a microtome object, disc; for squqring up blocks; for separating ribbons ip a water bath ... Hollow stainless steel handle doesn't heat up;' spring switch under ihumb gives Finger-Tip Heat Con. trol 'easy to keep knife at the right temperature. When not in use lay knife in saddle rest -.SladeUP keeps-knife hot; Blade DOWN current is "off."' 1tdiIIICOn microslide dryer delivers slides ready for staining in 7 minutesl Just drop slides, in an Autotechnicon Slide Carrier, into the hatch, flip the switch and close tho cover. A steady current of warm, filtered air blowing over the slides carries away al n)oisture, leaving them bone-dry and dustfree. The filter- is replaceable. There's no distor- tion, either -the warm deats air is' well -below the melting point of paraffin. t1~DU1ICKJ1 > water bath insures smooth, even spreading of your tisue ribbons. Th water temperature is just sight never too hot or -too told, hermostatically held at any set tompew4ure from 200 to 60°C. There's no mtig parafln to dis- . tort ti"sues -no folds or wrinkles,; io bubbls d.s)o < frequ-nt water change. Temnpraote itas n t, _day-hn, day-out. And ii's easy 16see your sections against th dull finished black intrtlor of th 0I* U *, D', , ! -- 1:THE TlE~HI;I Q COMPANY 115 5Eat 1493 S Nie,w York . . , Sen a. s -tt.,s .and p.cs on -fJ e~da.~F~aibuKnife ~ feAIcasMkrelldeDryer .~ [Xff0ScoGCondkm T mpoaueWetdgoa |t ~~~~~............................... .._*.. .. I;. D .- x 7-- 7- -- c ..' m r ... 121/" 1l1 V4 75 Wo IV -A ven; va -AM vt durabl*e; w_er ad -ro lqwl, 2 ft sv- 40 Mmma. IS

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Page 1: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

loD,TEkrS-sgis d-u-p laboratory chores

t10 Volts AC- DC_ 25 Wats

nlKlOfl paraffin knifemakes work with paraffin-embedded tissues quick andeasy. Great for cutting, large blocks iuto small ones;for mounting blocks on a microtome object, disc; forsquqring up blocks; for separating ribbons ip a waterbath ... Hollow stainless steel handle doesn't heat up;'spring switch under ihumb gives Finger-Tip Heat Con.trol 'easy to keep knife at the right temperature.When not in use lay knife in saddle rest -.SladeUPkeeps-knife hot; Blade DOWN current is "off."'

1tdiIIICOn microslide dryerdelivers slides ready for staining in 7 minutesl Justdrop slides, in an Autotechnicon Slide Carrier, into thehatch, flip the switch and close tho cover. A steadycurrent of warm, filtered air blowing over the slidescarries away al n)oisture, leaving them bone-dry anddustfree. The filter- is replaceable. There's no distor-tion, either -the warm deats air is' well -below themelting point of paraffin.

t1~DU1ICKJ1 > water bathinsures smooth, even spreading of your tisue ribbons.Th water temperature is just sight never too hot or-too told,hermostatically held at any set tompew4urefrom 200 to 60°C. There's no mtig parafln to dis- .tort ti"sues -no folds or wrinkles,;io bubbls d.s)o <frequ-nt water change. Temnpraote itas n t,

_day-hn, day-out. And ii's easy 16see your sectionsagainst th dull finished black intrtlor of th

0I* U *, D', , ! --

1:THE TlE~HI;I Q COMPANY1155Eat 1493 S Nie,wYork . .,

Sena.s -tt.,s .and p.cs on

-fJe~da.~F~aibuKnife~ feAIcasMkrelldeDryer

.~[Xff0ScoGCondkm T mpoaueWetdgoa

|t ~~~~~............................... .._*....

I;.D

.- x

7-- 7- --

c ..' mr ...

121/"1l1 V475 Wo

IV -A ven; va-AMvt durabl*e; w_er ad-ro

lqwl,

2 ft sv- 40 Mmma. IS

Page 2: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

adnonr Lio4jica/ Science3 SexLs

Turner - GENERAL ENDOCRINOLOGYWidely popular as a text for advanced courses in the biological sciences,this clearly written book approaches endocrinology on a truly biologiclevel. It analyzes the subject with unusual thoroughness, exploring andexplaining it in its anatomical, embryological, physiological and clinicalrelations. The interrelations of glandular activity; the characteristics ofall types of regulation in both plants and animals; the individual glandsthemselves-all are covered completely and interestingly.By C. DONNELL TURNER, Ph.D., formerly Chairman of Department of Zoology. Utiea Collegeof Syracuse University. 604 pages, 6" x 9", with 349 illustrations on 164 figures. $7.00.

Gardner - FUNDAMENTALS of NEUROLOGYStudents will like this graphic presentation of neurology. The authorsdescribe basic neuroanatomy and neurophysiology-as well as the funda-mental relationships of psychology to the higher nervous centers-in afashion which, for its clarity, is truly remarkable for a text of this kind.Progressing systematically from elementary fundamentals to more ad-vanced and complex concepts, the book is readily understandable to thestudent with a minimum background in biology.By ERNEST GARDNER, M.D., Professor and Head of Department of Anatomy, Wayne Univer-sity College of Medicine. 336 pages, 5i" x 8i", with 202 illustrations on 134 figures. $4.75.

DeRobertis, Nowinski & Saez - GENERAL CYTOLOGYThis noteworthy text is unusually well-suited to college courses-it islucid in presentation, modern in the methods and principles it describes.The authors employ a dynamic approach to cytology that stresses themorphological, physiological and genetic aspects of the subject. Amongthe illustrations will be found some of the most instructive electron mi-crographs ever published.By E. D. P. DEROBERTIS, M.D., Director of the Department of Cell Ultrastructure. Institutefor the Investigation of Biological Sciences, Montevideo: W. v. NOWINsKI, Ph.D., AssociateProfessor of Neurochemistry, University of Texas MIedical Branch, Galveston; and FRAN.cisco A. SAEZ, Ph.D., Institute for the Investigation of Biological Sciences, Blontevideo.Translated from the Spanish text "Citologia Generai" by WARREN ANDREW, Ph.D.. GeorgeWashington University. 345 pages, 6" x 9"!, with 143 illustrations. $6.00.

W. B. SAUNDERS COMPANYWest Washington Square Philadelphia 5

1December 14, 1951

Page 3: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

30 CHARTS - Over 600 Illustrations in Color for

PHYSIOLOGY, HEALTH, HYGIENE,

SAFETY and FIRST AID

>~~Ts3 Zt 328-tSe*@ sswAt............ .,.,70

.va~~~~I .-v L v3 .#._-_* ~~~~~~ .~~o' *t _~~~~~~~~0V~~~~~~~~~~~~M:v_Tw r3 Z m

l - ;i- it iE' 1gR0

No. 17-Vision of set No. 7050

Large size-29 x 42 inches, yet convenient to handle.

No. 7050. PHYSIOLOGY CHARTS, set of 30,in colors, in a metal charthead on

portable tripod, with manual .... $37.50

Charts 1 to 21 are edited byDr. A. J. Carlson, Emeritus Professor ofPhysiology, University of Chicago.

Charts 22 to 30 inclusive are edited byDr. Carl A. Johnson, Northwestern Univer-sity, and the American Red Cross, and Na-tional Safety Council facilities.

Original method of presentation with in-terest as primary motive.

Not Technical-body functions and proper

body care is underlying theme.Self-teaching-brief explanations on each

chart explain drawings without need of refer-ence to texts.

Color differentiation clarifies body proc-esses as well as emphasizing most importantfacts.

TITLES OF THE 30 CHARTSTHE CELL, 28 illustrations.CHEMISTRY IN PHYSIOLOGY, 20 illustrations.PHYSICAL CHEMISTRY IN PHYSIOLOGY, 22

illustrations.CELL FUNCTIONS, 24 illustrations.BLOOD, 15 illustrations.RED BLOOD CORPUSCLES, 27 illustrations.WHITE BLOOD CELLS, 16 illustrations.CIRCULATION OF BLOOD, 8 illustrations.WORK OF THE HEART, 11 illustrations.BLOOD FLOW AND PRESSURE, 20 illustrations.RESPIRATION, 21 illustrations.SOME BREATHING ACTIONS, 16 illustrations.THE ALIMENTARY CANAL, 9 illustrations.THE STORY OF FOODS IN THE BODY, 26 illus-

trations.THE ACTION OF MUSCLE AND NERVE, 11 il-

lustrations.MECHANISMS OF CORRELATION, 13 illustra-

tions.VISION, 25 illustrations.SENSORY MECHANISMS. Part II, 25 illustrations.GLANDS OF INTERNAL SECRETION, 12 illus-

trations.REPRODUCTION AND EARLY DEVELOPMENT,

23 illustrations.BODY DEFENSE AGAINST DISEASE, 30 illustra-

tions.HEALTHFUL LIVING, 48 illustrations.FOODS AND DIET, 21 illustrations.BACTERIA AND PARASITES, 26 illustrations.MAJOR MALADIES, 20 illustrations.COMMUNIT Y HEALTH, 35 illustrations.DRUGS AND MEDICINES, 29 illustrations.ALCOHOL AND TOBACCO, 24 illustrations.LIVING SAFELY, 47 illustrations.FIRST AID, 37 illustrations.

TEACHERS' MANUAL furnished with setcontains 128 pages of factual material, in-cluding 80 experiments.

Write for circular.

2 SCIN

i

---- ------------------------- ---- --------------- ----- ------ -- -------------

i.- .

,i. ---

SCIENCE, Vol. 1142

TmzCA.

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, SCIENTISTSAND

A LABORATORYTECHNICIANS

INSIST UPON THE BEST

ALCONOXZWORLD FAMOUS DETERGENTNo matter what you want to clean . . . blood,encrusted pipettes, metalware, porcelain ware,machine parts, instruments . . . no matter howdirty or greasy they may be . .. ALCONOX willmake them sparkling clean, film-free, streakless.

In hot or cold water, ALCONOX is equally ef-fective. It actually lifts off dirt, grime and greasefaster than anything you have ever tried.

SAVES ENERGY, SAVES TIMEJust wash and rinse. Toweling practically unnecessary.Economical too-one spoonful makes a gallon of activecleanser ready to go to work on your toughest job.

TESTED-USEDby many leading hospitals, laboratories, food andindustrial plants. Test it yourself on a tough job.

Available in:Box of 3 lb. - Price $ 1.95Carton (12x3 lb.) - ea. 18.00Bag of 50 lb. - lb. .40Barrel of 300 lb. - lb. .37(slightly higher on Pacific Coast)

If your dealer cannot supply you,write for literature and samples.

DEPT. S 12

ALCONOX, INC.manufacturing chemists61-63 Cornelison AvenueJersey City 4, New Jersey

U

SCIENCE, Vol. 114

IP H OTOVOLT

Exposure Photometer Mod. 200-Mfor

P H OTO M I C ROG RA P H Y

Accurate determination of exposure time Inblack-and-white and color photomicrography

Write for Bulletin #810 to Price $65.-

PHOTOVOLT CORP.95 Madison Ave. New York 16, N. Y.

CHEMICALLY PURE WATERfrom your faucet

with theLaMOTTE FILTER-IONNo installation necessary

Useful wherever chemically pure water is required,such as:

Photographic Work

Storage Batteries

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Sterilizers

Analytical Procedures

Hydrogen-Ion Studies

Blood Chemistry

Serology

2 models:Model W -supplies up to 10 gallons on one

charging, $3.85 eachModel W-D-supplies up to 20 gallons on one

charging, $5.75 eachBoth models may be recharged.

(Refill package $3.50 each)LaMotte Chemical Products Company

Dept. H Towson, Baltimore 4, Md.

4

Page 5: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

MEDICAL PHYSICS-vois. and2EDITED by OTTO GLASSER, Ph.D., Editor-in-chief

Head, Department of Biophysics, The Cleveland Clinic Foundation

The review of Volume I quoted at the top of this pageis from Radiology. It is typical of hundreds of commentsmade by the scientific press and by individuals in allfields of medicine and its allied sciences.

Those who already possess Volume I most certainly willwish to get Volume II since this second volume bothsupplements and complements the earlier volume, bring-ing it up-to-date and including also a tremendous wealthof entirely new information, especially on nuclear phys-ics. The two volumes together offer the most compre-

hensive and authoritative coverage of medical-physicaland biophysical problems in the English or any otherlanguage. This work is the standard reference on thesubject and as such belongs in every library, institutionalor personal, which must contain latest and most com-plete data on the hundreds of subjects covered by Dr.Glasser and his contributors. Volume II-1227 pages,978 illustrations, $25.00; Volume I-1744 pages, 1382illustrations, $20.00. Both volumes ordered at one time,$40.00, postpaid.

rg The Year Book Publishers, Inc.,200 East Illinois Street, Chicago 11

Please send, postpaid, MEDICAL PHYSICS.

C1 Vol. 1, $20.00. C1 Vol. I1, $25.00. C1 Vols. I & I1, $40.00.j2 Remittance enclosed. C1 Monthly payment plan desired.

Name . ... Street .

City.Zone .State .SC 12-14-51

December 14, 1951 5

Page 6: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

THE MICRO-FLOW REGULATOR * NUCLE4

@ DERI'

Adenosine TriphosphateAdenineAdenine SulfateAdenylic AcidAdenosineCozymaseCytidineCytidine SulfateCytidylic AcidCytosmeDesoxyribonucleic AcidFructosew6-Phosphate

(Barium)Glucose-l-Phosphate

(Potassium)GlutatroioneGuanineGuanine HydrochlorideGuanoeineGuanylic AcidHoease Diphosphate

OP

anc

VA

,ROTEINSd

kTIVES

HypoxanthineInostineIron NucleateManeanese Nucleate6 Methyl UracilNucleic Acid (Ribose

Nucleic Acid)Protamine NucleatePhosphoglyceric Acidd RiboseSodium NucleateSodium DesoxyribonucleateAmmonium UridylateThy-mine (5 Methyl

Uracil)UracilUridineUridylic AcidUramilXanthineXanthosine

Write for Revised Catalogue S 950 Listinga Complete Selection of Over 500

Important Biochemicals

NUTRITIONAL BIOCHEMICALS CORP.21010 Miles Avenue * Cleveland 28, Ohio

WALTON KYMOGRAPH

CHECK THESE POINTS THAT SPELL SUPERIOR

1. An unusual wide range of driving speeds without the dis-

adv3ntages of gear shifting.

2. Immediate change of speed without lag-tracing is con-

tinuous.

3. The number of possible speeds is infinite.

4. Speed changes made through dual controls-directly visible

and accessible.

5. Special automatic weight adjustment-an idler drum to

compensate for variations in temperature and humidity.

SCIENCE, Vol. 114

Here is a new clamp for regulation of flowthrough plastic or rubber tubing, 0"-3/y".

The smooth-acting ratchet per-mits minute changes of flowfor infusions etc., with exact

return to a former rate.One "click" equals.00078" movement of thepressure plate.

Constructed entirely ofstainless steel, with the

traditionally fine workmanshipof the Harvard ApparatusCompany, Inc. The cut showsactual size.

From stock, $5.00

Catalogue and price-list sent on request.THE HARVARD APPARATUS COMPANY, INC.Dover Massachusetts

.M

6

Page 7: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

THE MANUAL ofSTANDARDIZEDPROCEDURES forSPECTROPHOTOMETRICCHEMISTRY /

By HAROLD J. FISTER

Never before has a book like thisbeen published especially forclinical and biological techni-cians ... a book that will savehundreds of hours and hun-dreds of dollars in prepar-ing most procedures forspectrophotometric chem-istry.

Outlines, in detail, astep-by-step procedure for

performing each determina-tion. All methods were pains-

takingly worked out on the Cole-man spectrophotometer, but are adapt-

able to nearly every instrument marketedtoday, including Beckman, Brociner-Mass,

Klett-Summerson, Leitz, Hellige, Cenco, Lume-tron and Evelyn.

Includes only the latest and most approved clinicalmethods . . . accurate, easily applicable, simple. Allmethods were proved under actual working conditionsby independent authorities.

Price $30.00 per copy

Even if you use only a few of these many procedures, this manualwill pay for itself many times over in a very short period. Orderyour copy now or send for FREE DESCRIPTIVE LITERA-TURE.

STANDARD SCIENTIFIC SUPPLY CORP., Publishers34 West 4th Street, New York 12, N. Y.

Standard Scientific Su pi Corp.34 W. 4th St., New York 12, N. Y.Please send .... copies of Fister's Manual of StandardizedProcedures for Spectrophotometric Chemistry, at $30.00 each.o Payment herewith []Bill us

NAME ..................................................

ADDRESS ...............................................

December 14, 1951f 1

A A'a -0 ISAAPa a s dir--.A

a WIWWI WIWI WI I Wu 0 0 W

Page 8: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

11RECOMMENDED BOOKSFOR FALL CLASSES

192

COLLEGE PHYSICS. New 2nd EditionBy ROBERT L. WEBER, MARSH W. WHIE, and KENNETH V. MANNING, The Pennsylvania StateCollege. Ready in December

Presents the basic ideas of physics for students of science and engineering at the college level. Simple,direct, and concise explanations and solved numerizal problems help the student acquire exact knowl-edge of physical principles. The second edition has been carefully revised in accordance with im-provements suggested by a teaching of the first edition.

GEOLOGYBy 0. D. VON ENGELN, Cornell University, and KENNETH E. CASTER, University of Cincinnati.Ready in May

A basic text covering both physical and historical geology, this book starts with geologic phenomenafamiliar to the student, and, following this consideration of physical geology, presents the facts of his-torical geology as an outgrowth of the former. A strong narrative continuity is maintained throughoutwith logical sequences of chapters and topics.

MAN AND THE BIOLOGICAL WORLD. New 2nd EditionBy J. SPEED ROGERS, THEODORE H. HUBBELL, University of Michigan, and C. FRANcIS BYERS,University of Florida. Ready in April

A new revision of this selective presentation of biological principles, the second edition contains newmaterial on such topics as evolution, and the structure and function of the human body and of theplant, particularly as concerns hormones, vitamins, and physiology of blood, photosynthesis, and thetransport of water and solutes in plants. A series of skilfully drawn illustrations by William L. Brudongreatly increases the clarity of the overall presentation.

FIRST YEAR COLLEGE CHEMISTRYBy J. W. BARKER and PAUL K. GLAsOE, Wittenberg College. 501 pages. $5.00

A general chemistry text, representing a carefully planned course with the- modern viewpoint anddesigned to give the student a basis of facts and principles upon which he can predicate further workin chemistry. Emphasis is on the exposition of principles, but these are well supported by descriptivematter and historical background.

Send for copies on approval

McGRAW-HNILL BOOK COMPANY, Inc.330 West 42nd Street New York 36, N.Y.8 BCi5NCz, Vol. 114

Page 9: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

.- I., I...'...: " , I.. I.

VACUUM WORK

APIEZON®OILS, GREASES, WAXESApiezon products have therecognition of leading sci- jentists who accord them ° Oftj

top preference for highvacuum work. A bulletinjust off the press describesthe physical characteristicsof a variety of special oils,greases and waxes for oil-diffusion pumps, sealing joints, stop cocks,etc. You should have a copy to augment

your store of knowledge on the subject.Mailed free; simply ask for Bulletin 43-SM.

When Accuracy is Important.

THE CASTLE PRECISION INCUBATOR is de-

signed and built to give you the precise ac-

7W,_ t curacy that is essential in bacteriologicalwork. Construction is of monel metal forlifetime use.

Independent laboratory tests proved these

two important facts:

UNIFORMITY: i 7/s0C. Never as much as a

degree variation between top and bottom ofchamber even when loaded.

CONSTANT TEMPERATURE: 4 1/20 to 1/40C.Never more than a fraction of a degree varia-tion at the thermometer ... despite room

temperature fluctuations from 100 to 350C.

For full details write: Wilmot Castle Co.,

1212 University Ave., Rochester 7, N. Y.

eX00-0d0000;: -i; - vBacteriological... - 0 0 f;-0teApparatu

December 14, 1951

lw_-IwgiaqI

9.

Page 10: loD,TEkrS - Science...-sgisd-u-p loD,TEkrS laboratory chores t10 Volts AC-DC _25Wats nlKlOfl paraffin knife makesworkwithparaffin-embeddedtissuesquickand easy. Greatfor cutting,large

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Tailor I PHOTOMICRO LAB

to or

SPECIFIC NEEDSSolve your problems of visual and photographicmicroscopy with this versatile, adaptable Bausch& Lomb equipment-the world's finest by everyperfortnance test. A compact photomicro-graphic department-in one unit! Enjoy un-

I equLalled ease, speed and efficiency in all phasesof photomicrography.

a a a * .*t0-000000 * 0*. :0 -0 0 00.4

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is 1U*, X // ; E// L i_,, = ,,/1 - Ii .E : I f : \ : ::,: - : / _: :::f 0 f:f I b ::

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... to solve Problem

,Af -A= 4 4eIiPHOTOCOPYING

HIGH POWERPHOTOMICROGRAPHY

with transparentand

opaque specimens

LOW POWERPHOTOMICROGRAPHY

with transparentand

opctque specimens

kAi/ for detailed, informative Catalog No. E-210,and for advice on your photomicrographic problem.Bausch & Lomb Optical Co., 642-16 St. Paul Street,Rochester 2, N. Y.

SCIE,9CE, Vol. 114

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