NEW SERIES SUBSCRIPTION, $6.00VOL. 99, No. 2561 FRIDAY, JANUARY 28, 1944. SINGLE COPIES, .15

Fisher ELECTRO-HEMOMETER

Eliminates theHuman Factorin Measuring

_ ~~Hemoglobsinz..,+2 itj~~j,_ >P He*Measures Directly in Grams

per 100 ml. and % of Normal

The Fisher Electro-Hemometer (Pat. Ap-plied for) is a photo-electric instrument nowwidely employed for the specific purpose

of determining the hemoglobin content ofblood. It operates on the well-known acid-hematin method and provides the meafs ofmaking hemoglobin determinations with a

degree of accuracy and reproducibility notpossible by ordinary visual means.

This instrument embodies all the advan-tages of the photometric method while re-

taining the simplicity of operation thatfacilitates rapid use.

With the portable, self-contained Electro-Hemometer, different workers obtain thesame results because readings are made di-rectly without calculations and because no

human judgment in matching colors is re-

quired. The technique of taking and dilut-ing the blood sample is unchanged.

Complete, Compact, Portable UnitSupplied with the instrument are a Photo-

metric Cell, Standardizing Cell, DilutingPipette, batteries and printed directions.Simplified instructions for operation are

engraved on the panel.

Fisher Electro-Hemometer ...................... ...$... .... .. 65.00

(Leather Carrying Case, $5.00 Additional)

Manufactured and Distributed by

FISHER SCIENTIFIC CO. c ElMER AND AMEND717 Forbes Street, Pittsburgh, Penna. 635 Greenwich Street, New York, N. Y.

Headquarters for Laboratory SuppliesScience: published weekly by The Science Press, Lancaster, Pa.

Entered as second-class matter July 18, 1923, at the Post Office at Lancaster, Pa., under the Act of March 3, 1879.

2 SCIENCE-ADVERTISEMENTS

\ Bacto-AgarBacto-Agar is a purified Agar prepared from

domestic material. In the manufacture ofBacto-Agar extraneous matter, pigmented portions,and salts are reduced to a minimum, so that thefinished product in the form of fine granules willdissolve rapidly, giving clear solutions.

Bacto-Agar is distributed only for use inbacteriological culture media upon propercertification by the purchaser.

Bacto-AsparagineBacto-Asparagine is a purified amino acid

widely used in synthetic culture media and in thepreparation of tuberculin.

Specify "DIFCO"THE TRADE NAME OF THE PIONEERS

In the Research and Development of Bacto-Peptone andDehydrated Culture Media.

DIFCO LABORATORIESINCORPOMATEDDETROIT, XICHIGAN

PHYSIOLOGYA Polarographic Characteriza-tion of Nicotinic Acid andRelated Compounds. II-V

By Paul C. Tompkinsand

Carl L. A. Schmidt

University of California Publicationsin Physiology

Volume 8, No. 16, pp. 221-256,14 figures in text

Price, 50 cents

UNIVERSITY OF CALIFORNIAPRESS

Berkeley and Californla

ROENTGENOGRAPHICTECHNIQUE

A Manual for Physicians, Studentsand Technicians

By DARMON ARTELLE RHINEHART,M.D., F.A.C.R.

University of Arkansas, Little Rock, Ark.

Third edition. Octavo, 471 pages,illustrated with 201 engravings

Cloth, $5.50.

This new edition includes every advance in thefield of roentgenographic technique. Thirty-onenew figures have been added and the work has beencorrespondingly enlarged. Here is a standard pro-

cedure, thoroughly practical, successful and modernand applicable to whatever equipment is used inthe laboratory. The positioning and special pro-

cedures to be applied to each part of the body are

clearly presented. The work is complete, funda-mental, logical and simple.

LEA & FEBIGERWASHINGTON SQUARE, PHILADELPHA 6, PA.

For Pre -InductionScence Courses

SpeciFy

\Y/ROJECTORSA limited quantity of these projectors (which showsingle and double frame slidefllms and 2" x2" slides)has been released by W.P.B. for training purposes.For details on how to apply for authority to purchase,see your S.V.E. dealer or write Dept. is.

BUY WAIR BONDS!

SOCIETY FOR VISUAL EDUCATION, INC.100 East Ohio Street Chicago 11, I~mlloi

1

2 SCIENCE-ADVERTISEMENTS VOL. 99, NO. 2561

* Choline Chloride, Cystine and Methio.nine, prepared in the Research Laboratoriesof S. M. A. Corporation, are available tothe laboratory investigator in these conve.nient amounts.

CHOLINE CHLORIDE25 gram bottle........... 1..75100 gram bottle ........... 4.65

1000 gram bottle ........... 35.00

1-CYSTINE10 gram bottle ............. $1.00

100 gram bottle ............. 7.501 pound bottle ............ 15.50

dt-METHIONINE1 gram bottle ............ . $1.00

10 gram bottle ............. 9.00100 gram bottle ............. 60.00

For quotations on larger quantities, writeResearch Laboratories, S. M. A. Corpora.tion, Chagrin Falls, Ohio.

9edeasecd 2~f4ssatvsc^S. M. A. CORPORATION

DIVISION INCORPORATED

SCIENCE-ADVERTISEMENTS'

OP'RTUNITIES13R-(a) Bacteriologist to assist in clinical and

research activities, department of internal medicine, uni-lversity medical school; physician with Ph.D. degree pre-

ferred. (b) Physiologist or biochemist, preferably withPh.D. degree who would be willing to learn pharmacologi-cal research technics with view of eventually entering aca-

demic pharmacology; research post operated by industrycarrying academic rank, state university, extremely variedresearch offering opportunity for individual research prob-lems. (c) Instructor-department of biology, young

women 's college; must be qualified to teach Human Phys-iology and Biology; Middle West. S-400, Medical Bureau(Burneice Larson, Director) Palmolive Building, Chicago.

Sample Storage Set: Keeps 100 samples(8 ml) in orderly arrangement, indexed;compact. Fine for organic preparations,reference samples. $3.25, complete, money-back guarantee. R. P. Cargille, 118 Lib-erty St., New York 6.

IAn inexpensive Spectrometer ideal for

instruction in its uses and applications

This instrument has all the essential adjustments of larger more expensive models and can be used for all the stand-ard experiments. The 125mm circle reads to 1 minute by vernier. Collimator and telescope have 20mm apertures.An adjustable 8mm slit is provided. The telescope is supplied with the high power Gauss eyepiece, rack and pinionfocussing, and a tangent screw for delicate adjustment.

Send for Buletin 1-04

1 THE -GAERTNER1204 Wrightwood Avenue

SCIENTIFIC CORPORATIONChicago 14, U. S. A.

-A limited number of

LEITZ V1IIIs-2x2"2Slide Projectors

(Made In U.S.A.)

with 300 watt lamp and 4 or 5"

lenses are available

WITHOUT

PRIORITY.

Price

$99.00

Gamma Instrument Company, Inc.95 Madison Ave.,New York 16, N. Y.

A Pioneer in Small Pumps

THE MILLER WATER CIRCULATORA complete electrically driven unit

weighing 2.8 lbs.Carl D. Miller

327 Salem St. North Andover, Mass. ]

VOL. 992 No. 2561

JANUARY 28, 1944 SCIENCE-ADVERTISEMENTS

CONSTANT TEMPERATURE

WATER BATHS

S-84860-0.25VC ConstantTemperature Water Bath

Two models are available. One providesa temperature uniformity of ±0.01°Cand the other, a temperature uniformityof +0.250C. The circulating and heat-ing system common to both baths is a

feature largely responsible for their ex-

cellent performance and field servicerecord. The heating-circulating systemconsists essentially of motor, tower, im-peller and heating units, all assembledas a single compact unit. By meansof this arrangement, heat is correctlyapplied to the water at the point of

5-84805 0.01 0C CONSTANT TEMPERA'WATER BATH (Pat. No. 2,037,993)

Consisting of the container, the central circularheating unit with motor, the Sargent mercurial thulator, a cooling coil and constant level device, theZero Current Relay Unit complete with cord andconnection to standard outlet and with armored cccable for connection to the water bath. Diaminches; height, 10 inches; water depth, 91/2 inchperature uniformity, +0.01'C. For operation frvolt, 60 cycle, single phase circuit.........................S-84815 Ditto. But for 115 volt, D.C. circuitS-84825 Ditto. But for 230 volt, 60 cycle, singi

phase circuit ....................................................S-84835 Ditto. But for 230 volt, D.C. circuit

S-84805-.0O1C Constant

Temperature Water Bath

its most rapid circulation and uniformcirculation of the entire volume isassured.Both baths also provide a high ration

of unobstructed working space to overallsize by concentrating control equipmentwithin a small area. The baths are easyto clean and assemble. The integral heat-ing and circulating units are merely liftedout of the glass containers. Temperaturerange of both models from several de-grees above that of the cooling water toabout 60°C.

TURE S-84860 0.25`C CONSTANTTEMPERATURE WATER BATH

ting and Consists of central circulating andermoreg- heating unit which includes motorSargent and linear expansion type thermo-

plug for regulator with temperature refer-mnecting ence dial to facilitate selection of

Leter, 16 temperatures, cooling coil, constanties; term- level device. Pyrex glass container,iom 115 and cord and plug for connection

$150.00 to standard outlet. Height of Pyrexjar, 12 inches; depth, 12 inches;

155.00 water depth, 11 inches. Temper-

le ature uniformity +0.25'C. For op-

150.00 eration from 115 volt, 60 cycle155.00 circuit .................................. $80.00

E. H. SARGENT & CO., 155-165 E. Superior St., Chicago 11, IllinoisMichigan Division: 1959 East Jefferson, Detroit 7, Michigan

5

Ll

1

1=

6 SCEC-DERIEET VO.9,N.26

DISSECTING INSTRUMENTSPROMPT DELIVERY-REASONABLE PRICES

No. 2A set (Illustrated) only $1.30. Refer to our catalogue forother popular sets. Special sets made according to your speci-fications.

DISSECTING INSTRUMENTSMICROSCOPE SLIDESCOVER GLASSESMAGNIFIERSLENS PAPERSLIDE BOXES

MICROSCOPE REPAIRS - Any make.Estimates always submitted before doingany work. Satisfactory workmanshipguaranteed.

USED MICROSCOPES BOUGHT.Sell or trade your used microscopes andmicrotomes. Highest prices and allow-ances for used or obsolete instruments,micro-optics, etc.

Microscopes of all models urgently needed,even bare stands-any make.

Request catalogue if you do not have acopy.

THE GRAF - APSCO COMPANY5868 BROADWAY, CHICAGO 40, ILL

THE

!AUTOTECHNICON

U. S. Patent No. 21,157,876and Other Patents PendIng.

THE TECHNICON CO.NEW YORK, N. Y.

6 SCIENCE-ADVERTISEMENTS VOL. 99, NO. 2561

JAUR 28 194SINEAVRIEET

LoLag ELECTRICHEATERSand Controls

FOR the safe, economical, and efficient ap-

plication. of electric heat in the labora-tory, Aminco LoLag Electric Heaters andControls are the logical choice because theyhave been giving dependable year-in andyear-out service in laboratories throughoutthe world for over ten years.

Whether for heating fluids, semi-fluids,solids, air or other gases, there is an AmincoElectric Heating Unit that will do the jobdependably and efficiently . and thereis a wide range of standard units of varioustypes and reliable, time-tested automaticcontrols from which to select, or, Amincoheating specialists can design and buildspecial units for almost any heating re-

quirement.Write for Bulletin A-2075

Oven-heating Open-coil Type'For floor or wall mounting, for group-

.ing in any number or arrangement toobtain desired wattages for heatingovens, cabinets, etc.

Left: Flexible immersion type of Aminco electricheater, available In lengths up to 13 ft., which can bebent easily to fit any vessel and nested to providevarious combinations of heater wattages.Right: Pipe-thread type for screwing into various

types of vessels. Single and 3-heat types, with orwithout built-in switches.

OTHER TYPES ARE AVAILABLE ALSO

Klett made @..Glass Absorption Cells

Fused under high temperature with acid, alkali and othersolvent resisting cement. Optical flat walls. Many stock sizes.

Special requirements made to order.

Sole manufacturer in the UnitedStates of fused Blectrophoresis cells

Makers of complete Electrophoresis Apparatus

Klett Manufacturing Co.179 East 87th Street, New York, New York

No. 10 Analytical Balance

HENRY TROEMNERThe Standard of Excellence for 102 years.

Manufacturer of the highest grade Analytical,Assay and Pulp Balance and Weights of Pre-cision.

Catalog 1929S

911 Arch Street

Philadelphia, Pa.

I

-

JANuARY 28, 1944 SCIENCE-ADVERTISEMENTS 7

a

8 SCIENCE-ADVERTISEMENTS VOL. 99, No. 2561

Accuracy that Counts

on all FrontsAt first glance there would seem to be little re-lationship between an intricate, ten-foot longheight finder and a microscope objective withlenses of less than one millimeter in radius. Yetboth are the products of the same eyes, the samefacilities, the same standards of accuracy, thesame experience. Both are aiding in America'swar effort. Both are products of Bausch & Lomb.The lens computing and grinding skills that for

years have produced the minute, exceedingly ac-curate lens components of the microscope objec-tive are today also being employed in the pro-duction of height-finders and gunfire controlinstruments that are helping America's armedforces to win an earlier Victory.This quantity production of precision optical

instruments, pioneered and fostered by Bausch &Lomb through years of peace, has become ahighly valued asset to an America at war. Hereagain, because of its wartime accomplishments,Bausch & Lomb will be able to extend its opticalservicestopeacetime pursuitswhen Victory iswon.

Bausch &e Lomb Oil Immersion Objective-97X-N.A. 1.25.

For Bausch & LombInstruments essential toVictory-priorities gov-ern delivery schedules.

BAUSCH & LOMBOPTICAL CO. * ROCHESTER, N. Y.

ESTABLISHED 1853

AN AMERICAN SCIENTIFIC INSTITUTION PRODUCING OPTICAL GLASS AND INSTRUMENTSFOR MILITARY USE, EDUCATION, RESEARCH. INDUSTRY AND EYESIGHT CORRECTION

8 SCIENCE-ADVERTISEMENTS VOL. 99, No. 2561

SCIENCE

VOL. 99 FRIDAY, JANUARY 28, 1944 No. 2561

Science in the U.S.S.R.: Special Articles:Soviet Biology: DR. L. C. DUNN.................................... 65 Mammary Cancer and Mammary Structure in In-

Russian Explorations: SIR HUBERT WILKINS. 67 bred Stocks of Mice and their Hybrids: PRoFEssoRJOHN J. BITTNER and OTHERS. Aerosol, a NewSome Modern Conceptions of Amebiasis: DR. ERNEST Method of Applying Growth Regulators to Plants:CARROLL FAUST .69 C. L. HAMNER, H. A. SCHOMER and L. D. GOODHUE 83

Obituary: Scientific Apparatus and Laboratory Methods:L. Charles Raiford: DR. GEo. GLOCKLER. Levin A Spring-Pressure-Contact Electrode for Use inBowland Broughton. Recent Deaths.................................... 72 Electroencephalographic Recording: GEORGE A.

Scientific Events: ULETT and FRED B. CLAUSSEN........................................ 85Sur-News.......0..... ................ 10

gery; Affiliation of Psychological Organizations;The Cleveland Meeting of the American ChemicalSociety; Awards of the Institute of the Aeronau-tical Sciences; The Gibson Island Research Con- SCIENCE: A Weekly Journal devoted to the Advance-f,eren es 73.'n o Sc e e. Ed t r a o m n c t o s s o l e s n

to the Editors of SCIENCE, Lancaster, Pa. Published everyScientific ..................................................................

Discussion: THE SCIENCE PRESSThe College -Curriculum in Wartime and Intro- Lductory Courses in Biology: PROFESSOR ORDON LALEXANDER. A Poisonous Pea Contaminate: DR. Annual Subscription, $6.00 Single Copies, 15 Cts.COY W. WALLER Mercury in Drain Pipes: DR.SYDNEY . RA E DNBERG 78 SCIENCE is the official organ of the American Associa-SYDNvYC.ITEERG 7 tion for the Advancement of Science. Information regard-

ing membership in the Association may be secured fromScientific Books: the office of the permanent secretary in the SmithsonianApplied Mathematics: DR. RICHARD VON MISES ...... 81 Institution Building, Washington 25, D. C.

SCIENCE IN. THE U.S.S.R.SOVIET BIOLOGY'

By Dr. L. C. DUNNCOLUMBIA UNIVERSITY

AT the time of the tenth anniversary of the OctoberRevolution in 1927, I was in Moscow; I awakened each.morning in the little glass-sided cupola on top of thepalatial and elegant mansion which had now becomethe Institute of Experimental Biology. My first im-pression was one of familiarity, of at-homeness, forthis was a genetics laboratory, filled with the sightsand smells associated with the little fly, Drosophila,which breeds in its thousands in the milk bottles offermenting food which line all the genetics laboratoriesin the world. But in the farther distance, through thewindows, were the spires of Moscow, and these and thephysical world they represented were utterly strangeand new to me.

1 Address at the Science Panel of the Congress Celebrat-ing the Tenth Anniversary of American-Soviet Friendship,New York, November 7, 1943. The complete proceedingsof the Science Congress including the Medical Session willbe published at a later date by the National Council ofAmerican-Soviet Friendship.

This alternation of strangeness and familiarity musthave struck many American visitors to Russia, and itpersists when we try to examine the scientific achieve-ments of the Soviet Union or indeed of any countrynot our own. For any modern science is in some sensethe same wherever we find it, a part of one intercon-nected whole resting on common basic principles,with a common past and a common future, and it isartificial and deceptive to try to break it into separatenational entities. And yet, just as the history ofscience consists in part of the achievements of indi-viduals, so also it rests on the contributions of groupsof persons with common purposes and common meth-ods, and oftentimes the character of these groups isdetermined by the physical, economic and socialmilieu. It was unquestionable that the society behindSoviet biology was very different from that found inEurope and America, and this, together with the tem-perament, traditions and outlook of the Soviet scien-