SCIENCE NEW SERIES FRIDAY OCTOBER 19 1945 SUBSCRIPTION, $6.00 VOL. 102, No. 2651 ' SINGLE COPIES, .15 BAU SC H & LOM B BALO PT ICO N MODEL LRM AVAILABLE NOW. The LRM Balopti- con is now in production for civilian use. This instrument permits a whole group at one time to see and study large, clear, brilliantly projected pictures from lantern slides or opaque objects. Balanced illumination per- mits changing from one to the other without noticeable difference in screen brilliancy. Pic- tures can be projected from books, magazines,, clippings, photos, even from actual objects or specimens. A built-in blower cooling system protects the projection material. Write for Catalog E- 1 1, "Balopticons and Accessories." Bausch&Lomb Optical Co.,Rochester2,N.Y. A_~~~~~~~~~~~~ BAUSCH & LOMB ESTABLISHED 1 8 5 3 Published weekly by the American Association fo r the Advancement of Science at Lancaster, Pa. Entered as second-class matter July 18, 1923 at the Post Office at Lancaster, Pa., under the Act of March 3, 1879.
Transcript
SCIENCENEW SERIES FRIDAY OCTOBER 19 1945 SUBSCRIPTION, $6.00VOL. 102, No. 2651 ' SINGLE COPIES, .15
BAUSCH & LOMB BALOPTICON
MODEL LRM
AVAILABLE NOW. The LRM Balopti-con is now in production for civilian use.This instrument permits a whole group at onetime to see and study large, clear, brilliantlyprojected pictures from lantern slides oropaque objects. Balanced illumination per-mits changing from one to the other withoutnoticeable difference in screen brilliancy. Pic-tures can be projected from books, magazines,,clippings, photos, even from actual objects orspecimens. A built-in blower cooling systemprotects the projection material. Write forCatalog E- 1 1, "Balopticons and Accessories."Bausch&Lomb Optical Co.,Rochester2,N.Y.A_~~~~~~~~~~~~
BAUSCH & LOMBESTABLISHED 1 8 5 3
Published weekly by the American Association for the Advancement of Science at 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 VoL. 102, No. 2651
Bacto-AgarBacto-Agar is a purified
Agar prepared from domes-tic material. In the manu-facture of Bacto-Agar ex-traneous matter, pigmentedportions, and salts are re-duced to a minimum, so thatthe finished product in theform of fine granules willdissolve rapidly, giving clearsolutions.
DIFCO LABORATORIESINCORPORATED
DETROIT 1, MICHIGAN
)vi YA: a]A V4.jfl .f
Acidimetry-AlkalimetryLaMotte Acidiaetlric and Alkallmetric Standards arehighly purified comnpounids that are widiely used asprimary standards; in volumetric annlysis.
LaMotte Chemical Products CompanyDept. "H" Towson 4, Baltimore, Md.
GEOLOGICALASSISTANTEl'
Reply to B-53:P. O. Box 3495
Philadelphia 22, Pa.
Large Oil Company requires ser-vices of experienced man in homeoffice in East. Salary to fit the man.Write full particulars, education,experience, references.
Uniform environment is necessary for the productionof uniform animals. Feed is an important environ-mental factor and by careful feed tests we assure an
optimum diet to every animal in our colonies.
PHOTOVOLTOptical
Fluorescence Comparator
For quantitative analysis of fluorescent solutionsby means of fluorescent standards; for vitanmins,quinine, atabrine, drugs, oils, organic and Inor-ganic compounds.
High sestivity Simple In operationSuitable for use under any power line andatmospheric conditions including tropics.
Write for literature
PHOTOVOLT CORP.95 Madison Ave. New York 16, N. Y.
1
2 SCIENCE-ADVERTISEMENTS VoL. 102, No. 2651
Angandboomb%&I.
SCIENCE-ADVERTISEMENTS 3
a ,s9Qt microslide filing cabinet offeringA45 greater
t amazingly low costsThis new "LAB-AID" cabinet is the ultimate solu-
tion to the filing problems encountered in thelaboratory. It is of welded-steel, fire-resistant con-struction throughout. Files 3"x 1" or3"x2" micro-slides, 2"x2" transparencies, large lantern slides,index cards, even paraffin blocks ... in single-rowdrawers, all fitting interchangeably Into a smooth-tracking master drawer-rail system. Unit-sections,assembled in any combination, can be used singly,or stacked to any convenient height. With all theseadvantages, the cost-per-slide capacity in the"LAB-AID" cabinet is the lowest ever. Investigatethis remarkable equipment ... the coupon willbring details.
the(new steel
laboratory filing cabinetA single "LAB-AID" unit-section. Anycombination of drawers can be supplied.
By merely dropping in a pat-ented"LAB-AID" slotted liner,|any drawer is converted fromstowrage filing to individual-Stet______________________slide filing, or vice-versa.
THE ecEneIcon COMPANY
OCTOBER 19, 1945
4
VITAMIN TESTCASEIN
IN VITAMIN EXPERIMENTATION thetype of protein used may well bethe most important dietary factor.When Vitamin Test Casein GBIis the protein of choice in the de-ficiency diet, uniform and consist-ent depletion oftest aninals occurswell within the required time in-terval specified by the U.S.P. orother standard test methods.Vitamin Test CaseinGBI is pre-
pared by a special hot alcohol ex-traction method, which removesnot only the fat soluble but thewater soluble vitamins as well. Itis therefore free of vitamins A andD as well as the known factors ofthe B complex and vitamin K.
Vitamin Test Casein GBI issupplied in: 1 lb. bottles, 5 lb.,25 lb., and 100 lb. fiber drums.
PROMPT DELIVERY
GENERAL BIOCHEMICALS, INC.DIVISION WYETH INCORPORATED
LABORATORY PARK, CHAGRIN FALLS, OHIO
I _e1
OCOFR1,14 CENEAVRIEET
'by 3t isethod,~~~~~thse6.12 e ~that. b~ the US o~Bure ctio1.942tho *
5
Ue re1~~~~~~~c~~'0 n e uionl p oXdUeerr en' th sri seor n spa
ttd ed tettod r 1lixthr r trt %iid g,42 .tooOOoenW y U.co h0.' far i ofl ,2t1
Lt0laotcri I aein P16 essoi:;nxon a prioiImontw to
~reovd 0the pred ,,,1.xorodt *ctior Po 0 Ile hIhe re alor o r the.ioe or extosnbO hrave do
toed~1.oh OflOtou6oiin* toa w itia t1111 an~~~~~~~~~~~~~~~~~~~~~~?hor6t 'Ld tand '~
rfoota0led ofh ero-i 1.Zu v
t nja 9zL t'We f Oxl p~euCOtlor seol rp___. o
basi~sur~ae bevelm hae,
OCITOBER 19, 1945 SCIENCE-ADVERTISEMENTS 5
6 SCIENCE-ADVERTISEMENTS VOL. 102, No. 2651
DE TONIZED WATERReplaces DISTILLED WATER
at 1% to 10% of the cost of distilled water
In innumerable applicationsand in most localities the De-Ionizer will prove 10 to 100times as economical as a still,for the production of highpurity water.
Meeting the needs of labora-tories using a relatively smallamount, the Laboratory De-Ionizer will deliver 12 gallonsper hour of high purity water,comparable to that producedby distillation.
The upkeep of this unit isnegligible, no gas or electric-ity is used for heat, no coolingwater is required, no installa-tion costs necessary and theoriginal investment is low.
The original fillings of resins are very stable; they can be regeneratedhundreds of times and all indications show their life to be more thana decade.The localities that are not able to use this system are rare, and we suggestyour further investigation of its possibilities in your work.
A postcard inquiry will bring you complete details. Ask for Bulletin66475.
IJIlU APh1X
*
Col I-
me man.t. £
7CORATO1A
Y 1735 NORTH ASHLAND AVENUECHICAGO APPRATUS CONIAADAMCHICAGO 22, ILLINOIS
6 SCIENCE-ADVERTISEMENTS VOL. 102, No. 2651
I
SCIENCE-ADVERTISEMENTS 7
F WITH
CALl BRATIONS
The clinical type C-5 "Photelometer" now is available with calibration tables andprocedures for the determination of hemoglobin, blood sugar, non-protein nitrogen,urea nitrogen, creatinine and uric acid.
No. A.C. ................................ .. ........................................ $135.00
Specially prepared and tested solutions for use with the calibrated "Photelometer" areindicated below. Included in each set of reagents is a standard sample for verifyingeach calibration.(P2) Set of Reagents for Preparation of 60 Folin-Wu filtrates ....................................... $2.00
(P3)Set of Reagents for 150 Glucose Determinations .............................................. ....... 1.20(P4) *Set of Reagents for 15 to 50 Creatinine Determinations ............................. 1.45
Now Available_~~~~~~~Z N .Pure Biotin, identical with the natural
product, has been produced by a total
synthesis accomplished by chemists inthe Merck Research Laboratories.This achievement marks another mile-stone in the remarkable series of im-
portant discoveries and advances madeby Merck chemists and their collabo-rators in vitamin research. We are
Pleased to announce that pure Biotin
now is commercially available. For the
present, however, supplies of this newly
synthesized member of the vitamin B
complex are necessarily limited.
FOLLOWING the development of a new medicinal agent in theMerck Research Laboratories, it becomes the responsibility
of the Pilot Plant to develop practical manufacturing processes.
In the Pilot Plant, every step in the required production of a newproduct is charted and analyzed and, when necessary, new ma-
chinery and procedures are devised to achieve the desired results.
Merck Pilot Plants produced the first significant quantities of
such vitamins as Thiamine, Pyridoxine, and Biotin, and here,
too, the world's first appreciable clinical supplies of Penicillinwere processed. Truly, the Pilot Plant is a vital link between thelaboratory where minute quantities of some new drug or chemicalare created and the factory where eventual large-scale productionof that material is achieved.
.5
MERCK & CO., Inc. AdAm&4 RAHWAY, N. J.
OCTOBER 19, 1945 SCIENCE-ADVERTISEMENTS 9
Ill
Photography ofCathode RayTube TracesT he choice of a film for photographing cathode ray traces depends on
the color of the light from the screen, the persistence time, and whetherthe trace is transient or stationary.The Kodak Research Laboratories have recently completed tests of all
Kodak materials under typical conditions of use of cathode ray tubes. Ma-terials for a specific use can be selected on the basis of the data in the tableshown below. Further details are given in a revised pamphlet on this sub-ject. Copies are obtainable on request.
RELATIVE SPEEDS OF KODAK MATERIALS FOR CATHODE RAY PHOTOGRAPHY
Materials Transient Pattern Stationary Pattern.______________ (Blue Screen) (Green Screen)Sheet Films
EASTMAN KODAK COMPANYResearch Laboratories Rochester 4, N. Y.
the PressRATORYAPPARATUS us 0S e e so
Our newest catalog brings you
news of the latest developments
in laboratory apparatus and
supplies.
You may have a copy without
charge by writing for it on yourfirm or institution letterhead.
NEW YORK LABORATORY SUPPLY COMPANY, Inc.Keyed for efficient service to industrial
and institutional laboratories.
NEW YORK 13, N. Y.78 VARICK STREET11
om
OCTOBERL 19,1 1945 SCIENCE-ADVERTISEMENTS 9
10 SCIENCE-ADVERTISEMENTS
For bridging the gap
between unaided visionand microscopy, we offer
The Master Magnifier SetAn assortment of fine magnifiers with
these unusual features:
Contains 7X, 20X and 40X magnifying units.
Built-in lighting units illuminate the objectsviewed; operated either by batteries, for field work,or by electric current, for office and laboratory.
The 40-power is fitted with a 0.001 inch scale.This will indicate dimensions of small objects anddetails not measurable with ordinary micrometers.
All in compact portable case
Ask for leaflet S-M
R. P. CARGILLE
WELL GEOLOGISTSTo watch progress of wells inEastern Venezuela. Care- forsamples, picks, casing points,core points, etc.
Write to:
THE ATLANTIC REFINING CO.P. 0. Box 7258 (Room 900)
Philadelphia 1, Pa.l
ESSENTIAL OILSAROMATIC CHEMICALS
PERFUME BASESBALSAMS, OLEORESINS
S. B. PENICK & COMPANY50 Church Street New York 7, N.- Y.
10 SCIENCE-ADVERTISEMENTS VoL. 102, No. 265-1
118 Liberty Street New York 6, W. Y.
OCTOBaR 19, 1945 SCIENCE-ADVERTISEMENTS Iii
. . . the proved method and equipment forunlimited preservation, without refrigeration,of highly perishable plasma, penicillin, serumsand other biologicals.Stokes Lyophile-Cryochem types of freeze-dryingequipment for dessication from the frozen state, hasbeen a vital key to the development of the Penicillinand Blood Plasma Programs. It is equally valuable inthe preservation of serums and labile biologicals. Themethod is one of Drying by Sublimation* underhigh vacuum.
Over 10 years ago Stokes, in conjunction with theUniversity of Pennsylvania and Sharp and Dohme,pioneered in the development of equipment for usecommercially as well as for laboratory and hospital.jlour. of Imtumnology, Vol. 50. No. 1. 1945
Today, more than 275 Stokes units are in use on allkinds of products in universities, research laboratories,government health services, hospitals and commercialplants throughout the United States, and 24 foreigncountries.
Stokes engineers and manufactures complete equip-ment for this process, from test tube to full-scalkproduction capacity.Facilities and authoritative assistance are availablefor research, development and application of dessica-tion from the frozen state. A complete pilot plant inthe Stokes Laboratory is used for tests and demonstra-tions. Wide field experience is also at your disposal.Our technical staff invites your consultation.
F. J. STOKES MACHINE COMPANY5958 Tabor Road Philadelphia 20, Pa.
'ASOCTOBER 19, 1945 SCIENCE-ADVERTISEMENTS
12 SCIENCE-ADVERTISEMENTS VoL. 102, No. 2051
WELCH DUO-SEAL VACUUM PUMPS
THE IDEAL FORE-PUMPfor diffusion and molecular
drag pumps-also forvacuum distillation
Cat. No. 1403 Duo-Seal Vacuum Cat. No. 1403-B with 1/2 H.P. 110Pump.. $100.00 Volt A.C. Motor mounted on
Base . $145.00
VACUUMGUARANTEED0.005 mm Hg or
5 microns
Rotor and statorsurfaces are ground
and polished to1/10,000
inch tolerance.
0
All pumps arefully broken in
by long test runs.
0
Smooth andQuiet in operation.
S
No Priorityor W.P.B.ApprovalRequired
OPERATES AT 375 RPMwith two sweeps per
revolutionMoving Parts Last Longer
FREE AIR CAPACITY1700 ml per second
(102 liters per minute)510 ml per sec. at 5 microns
ONLY 1400 ml (3 pints)OIL REQUIREDnever "backs up"
Low Operating Cost
Write for complete circular.
W. M. WELCH SCIENTIFIC COMPANYEstablished 1880
1515 Sedgwick St., Dept. E Chicago 10, Ill., U. S. A.
I
12 SCIENCE-ADVERTISEMENTS VOL. 102, No. 2651
SCIENC-EVOL. 102 FRIDAY, OCTOBER 19, 1945 No. 2651
The American Association for the Advancement of Discussion:Science: Continuity and Discontinuity in Evolution: DR.
The Appointment of Dr. Willard L. Valentine as ALEX B. NOVIKorF. Toxicity of Nematode In-Editor of Science: DR. F. R. MOULTON ........................ 387 fested Chewings Fescue Seed: DR. J. R. HAAG.
Significance of Negative Results in Small Samples:"Unto One of the Least of These": D. ORLANDO DR. MORTON L. LEVIN and DR. HYMAN GOLDSTEIN.
PAREK.. ..... 389 The Riumbling of Thunder: PROFESSOR ARTHUR
Obituary: TABER JONES ........ 405
Carlton C. Curtis: PROFESSOR- EDWIN B. MATZKE. Scientific Books:Deaths and Memorials ................. 390 The Theory of Resonance: DR. ERNST BERLINEL
Qualitative Analysis: DR. FREDERICK R. DUKE.Scientific Events: ...... XA Country Medical College: DR. REGINALD FITZ.The Forest Products Industry in Germany; Gift Climate: DR. V. CONRAD ..... ................ 408of the Charles A. Browne Collection to the EdgarFahs Smith Library of the University of Pennsyl- Science News ..................... 14vania; In Honor of Dr. C. S. Hudson; News fromhabroad 392 SCIENCE: A Weekly Journal, since 1900 the official
Organ of the American Association for the AdvancementScientific Notes and News............................................ 395 of Science. Published by the American Association for
the Advancement of Science every Friday at Lancaster,Special Articles: Pennsylvania.
The Toxicity of Influenza Viruses: DL. WERNER Editors: JOSEPHINE OWEN CATELL and JAQUES,HENLE and DL GERTRUDE HENLE. Immunogenetic CATTELL.Consequences of Vascular Anastomoses betweenBovine Twins: DR. RAY D. OWEN. Growth Inhi- Policy Committee: MALCOLM H. SOULE, ROGER ADAMSbition by Analogues of Pantothenic Acid. II. a- and WALTER R. MILES.and P-Substituted Pantothenic Acids and Related Advertising Manager: THEO. J. CHRISTENSEN.Compounds: DR. WILLIAM SHIVE and PROFESSORESmoNDE ..SNELL.398 hommunocatlons relative to articles offered for publicationESMOND E. N LL ...............................................3should be addressed to Editors of Science, The Science Press,
Lancaster, Pa.Scientific Apparatus and Laboratory Methods: Communications relative to advertising should be addressed
Preparation of Shark Chondrocrania for Class Use: to THEO. CHRISTENSEN, Advertising Manager, SmithsonianInstitution Building, Washington 25, D. C.
DL. R. STOHLEL.A Method for Measuring the Communications relative to membership in the AssociationEffects of Acid Beverages on the Teeth of Small and to all matters of business of the Association should beLaboratory Animals: COMMANDER J. S. RESTARSKI, addressed to the Permanent Secretary, A.A.A.S., Smithsonian
Institution Building, Washington 25, D. C.LIEUTENANT (jg) R. A. GORTNER, JR., and LIEU-TENANT COMMANDER C. M. MCCAY ............................ .. 403 Annual subscription, $6.00 Single copies, 15 cents
THEAMERICAN ASSOCIATION FOR THE ADVANCEMENTOF SCIENCE
THE APPOINTMENT OF DR. WILLARD L. VALENTINE AS EDITOR OF SCIENCEBy Dr. F. R. MOULTON
PERMANENT SECRETARY
AT the close of this calendar year Dr. Willard L.Valentine, professor of psychology and chairman ofthe department of psychology in Northwestern- Uni-versity, will assume full editorial charge of SCIENCE.A psychologist at the noon of life becomes the suc-
cessor, after an interval of nearly two years, of Dr.J. McKeen Cattell, also a psychologist, who was
editor of SCIENCE from the time he purchased it in1895 until his death on January 20, 1944. Since Dr.Cattell's death Mrs. Josephine Owen Cattell and Mr.Jaques Cattell have edited SCIENCE.
There are few positions which offer such favorableopportunities fdr contributing broadly to the advance-ment of American science as the editorship which Dr.Valentine is assuming. SCIENCE for nearly 46 years
has been the official organ of the Association, appear-ing weekly, with its columns open not only to every-thing pertaining to the work of the Association butalso to science in every field. Its influence on Ameri-can science has been very great and it promises tobe greater in the future.
In preparation for the future of SCIENCE, theExecutive Committee of the Council last winter ap-pointed a SCIENCE Policy Committee consisting ofDrs. Malcolm H. Soule, chairman, Roger Adams andWalter R. Miles. This committee made a survey ofthe kinds of material published in SCIENCE and theamount of each kind. The war, of course, has affectedgreatly the offerings to SCIENCE, partly because fewmeetings of scientific societies have been held since
