more than a mere instrument - a completely integrated System for histologic preparation ... ...... .. .E . ... .Es .... .. ... .. 0EE.;E.............................................................................. (. .R ..... .. ;.Ti .00 . .0 TECHNIC( MICROSCI 0 Q LAB-AID lIFE I SLIDE Fl m- These are the elements of IDE DRYER the Autotechnicon histologic processing system . . . each a DN notable technical contribu- :OPE LAMP tion toward making the work of the pathological labora- ILES tory easier, with better, surer results. .&s_1- THE TECHNICON COMPANY 215 East 149th Street, New York 51, N. Y. Vr7 1". 41.
Transcript
more thana mere instrument -a completely integratedSystem forhistologic preparation
m- These are the elements ofIDE DRYER the Autotechnicon histologic
processing system . . . each aDN notable technical contribu-:OPE LAMP tion toward making the work
of the pathological labora-ILES tory easier, with better, surer
results..&s_1-
THE TECHNICON COMPANY215 East 149th Street, New York 51, N. Y.
Vr7
1".
41.
numeroEstercomplish W lsliam.s
Chiamydomonas could not really be considered as serious competitionfor Miss Esther Williams-neither in the 100-yard backstroke nor innumerous other regards.'Still, he can swim a little bit. Many, given his equipment, would ac-
complish far less.
Furthermore, one must in all honesty bow to the extraordinary ver-satility of his efforts toward filling the waters with little Chlamydo-monas. Science has seen few to equal him in this regard.Lastly, Chlamydomonas is distinguished for the fact that he appearsto be on (or at least mighty close to) the main line of -evolution lead-ing to the higher plants. It is this .circumstance which most intriguesDr. Edward Dodson, author of the new Textbook of Evolution.Dr. Dodson devotes three very interesting pages to Chlamydomonasand the Origin of Sex. These three pages are typical of the readabilityand the teachability of the entire book-it's a really satisfying text inevery way. If you haven't seen a copy, write today.
'One scientist was heard to comment, after meeting Miss Williams, that in hisopinion evolution had progressed just about far enough. Dr. Dodson completelyignores this incident in his chapter on Retrospect and Prospect (Man and theFuture).
By EDWARD 0. DoDsON, Assistant Professor of Zoology, University of NotreDame. 419 pages, illustrated. $5.00.
W. B. SAUNDERS COMPAiNYWest Washington Square Philadelphia 5
September 19, 1952 1
an I---SI
COMPACT-only 26 inches tall-weighs but 20pounds
MADE OF a durable, washable SYN-THETIC COMPOSITION TO RE-SIST ALKALIES AND ACIDS
CAN BE ROTATED within the caseor suspended outside for study
Produced under competent medicalguidance by skilled craftsmen.
No. ZK 500
Illustrated key card permits student to observe skeleton and keytogether-enabling him to more easily understand the skeleton.
No. ZK 500-Miniature Skeleton, Painted. The muscular insertionsare painted on one side. Complete with attractive wooden case, plasticskeleton cover, and illustrated key card.. Each $130.00
No. ZK 510-Miniature Skeleton, same as ZK 500 but not painted,Each $115.00
FULL, Life-Size, Plastic Skeletons available at $195.00.
SPECIALUse this catalog as a "one stop" source |k1SEARC lofAmino Acids, Vitamins, Carbohydrates, |Adenylates, Nucleates, Purines, Pyrimi-dines, Tetrazolium Salts, Enzymes, Micro.biological and Bacteriological Media, WRITE FORComplete Animal Test Diets and YOUR COPYIngredients for investigational use. TODAY
GENERAL BIOCHEMICALS, INC.S0 LABORATORY PARK * CHAGRIN FALLS, OHIO
a MIGHTY LIGHT IFROM A SMALL SOURCE
'POINTOLITE" LAMPS
Laboratory workers rely on Pointolire'sdependable, steady light that requiresno attention after starting. Illumina-tion is an intensely brilliant, remark-ably white, "point oflight". Designedto fit scientific optical instrumentsfor photographic and projection pur-poses. Lamps in various candle-powersizes aLnd necessary auxiliary equipmentaedescribed and listed in Bulletin S.
SCIENCE, Vol. 116
No. 2A DISSECTING SET .......... $2.00 eachLess 10% on 6 dozen or more
A very popular college set. Other sets listed in ourcatalogue or we shall make up sets according to yourspecifications.
No. 19FDoublet
Magnifier9 s ~~~~~~~~~~10XMetal Mountea. $2.00
THE GRAF-APSCO COMPANY5868 Broadway Chicago 40, Ill.
.1
PYREX BRAND TEST TUBES-Twenty-two standardsizes from 10x75 mm. to 65x500 mm. Strong, sturdy...tops for applications encountered in school chemistry.
PYREX BRAND THISTLE TUBES-With uniformmolded bodies-a choice of heavy or extra heavywalled tubes.
Coc#8 e 214o/
A recent survey* among 50 high schools indicated thatPYREX® brand Test Tubes outlasted other brands 2 to 1.Why? Simply because PYREX brand glassware standsmore physical and thermal shock besides remainingchemically inert in the presence of acids and many alka-line solutions.
It all adds up to economy for you. Breakage is reduced,replacements cut. So whether you need test tubes or othertypes of laboratory ware, always ask for PYREX brandand save money. Your laboratory dealer stocks it for you.*"Which Tcst Tubes Shall We Buy' - W. S. Lapp Sciencc Tcacher
Vol. XVII, No. 3, October 1950
PYREX BRAND FUNNELS-All kinds-fluted, plain,long stem, short stem, big diameter, small diameter, andstemless, all ruggedly fabricated from the chemicallystable and heat resistant PYREX Brand glass 7740.
CORNING GLASS WORKS, CORNING, N. Y.
VISIT THE NEW CORNING GLASS CENTER
September 19, 1952 55
REDMOND 115 V. A.C. 5" DIA. 2" ORI-FICE, POWERFUL BLOWER OREXHAUST FAN FOR LABORA- 85
4'c.T1|r_ _) I~COB
DO YOU SUFFER FROM HIGH VOLTAGE ?DO YOU STRUGGLE WITH LOW VOLTAGE .
A Westinghouse 100 Watt Isolation Trans-former will be your solution 150 V. to 110 V. or $ 50110 V. to 150 V. or any voltage 40 V. up ordown. Wght. 6 lbs.......................
ronic acid and its lactonehave long been of biologi-cal interest because of theirimportant role in detoxica-tion mechanisms. The acid
CHOHHCOH 0
isas f
IHCOH
is also found in thebody as a structural constituent of essentially allfibrous and connective tissues.
Synthetic Source: Synthesis from D-glucose now providescommercial quantities of high purity GLUCURONO-LACTONE for study and use. .
Detailed Data: New booklet describing properties andclinical aspects of GLUCURONOLACTONE is nowavailable. Send for your copy today.
Chemical + Division
CORN PRODUCTSREFINING CO.
17 BATTERY PLACE * NEW YORK 4
SCIENCE, Vol. 116
N ssco "IDEAL FLOWER" ModelMade of Nyssco
"Everlasting" Rubber Compositionnewly-developed dissectible model of a typicaldicotyledonous flower, showing many special fea-
tures that have never before been incorporated in amodel of this kind. In addition to the usual struc-tures of petals, sepals, anthers, pistil, etc., the follow-ing reproductive processes are presented:
(a) Two interchangeable pistils showing three stages ofpollination, and two stages of fertilization in the em-bro sac.
(b) One anther entire, and three hemisected to show thrcestages in pollen formation:(1) Sporogenous tissue formation(2) Spore tetrad formation(3) Formation of two pollen chambers with mature pollen
grains.N o other model available shows so many essential and
distinctive features. As the originators of biologicalmodels made of rubber composition, with years of ex-perience, we guarantee a product unsurpassed forquality of material, workmanship, and scientific ac-curacy.RPRICE: Fully colored, size 19" x 161/2" $59.50
Ask for Cat. No. 71-Biological Models and Charts
EST. 1919
NEW YORK SCIENTIFIC SUPPLY CO., Inc.28 West 30th Street General Supplies for Biology and Chemistry New York 1, N. Y.
1-
rp
_
| ~~~~~~~~~~psych(progr(ing Tr
&S&a5tVVU LYTEfor projecting opaque materials
of. instrucrio
MASTER VU-GRAPHfovred daI91
for overhead, daylignr,
transparency projectionh the VU-GiRAPH you can lectue four greatestilighted room, pacing your lecture for greatest
ice attention. ln addition, you can now gain the
ological avantage made possible by the use of
essive disclosures, overlays, and actual plastic work-
esodels. And with the roll attachment, using wax
crayon, you can write spontaneous notes, or, if
desired, prepare an entire lecture in advance.
Special attachments available for projecting3¼/4 x 4 and 2 x 2 slides and also 35 mm. film
strips make the MASTER VU-GRAPH the most
flexible medium ever devised for graphic presen-
tation by projected transparencies.
N4aps, diagrams, illustrations, and text can be pro-
jected in a partially lighted room without need for
mounting or special holders. The Vacumatic* Plateno inge sheets up to 10 x I1 flat withoutnd the FeedOhMatic Conveyor a5ltomatically feeds
in new copy and ejects the old as the lesson proceeds.
Withoutlaving the VUJ-LYTE, you can direct
weialhattlenti to salient features by the exclusive,
built-in Pointex, Projection Pointer, which throws a
movable arrow of light on any part of the screen.
The Beseler VU-LYTE is the most versatile, con-
venient, and efficient opaque projector ever p
Learn how, these two Projectors can
make teaching more effective for you.Folders descrihing these and other vis-
ual aids in detail uwill be sent on request,or free demonstration arraiged in yourown Projection room.
*Patent PendingtPatented
C H A R L E SCOMPANY
60 BadLarges or Avenu e, Neewa rk 8,Nj . JE.World's Largest Manufacturer of Opaque Projection Equipment
September 19, 1952
I
l
I
pp
of instruction
Drying Problemc>4Solvedby New Method
0
New, Niagara "Controlled Humidity" Method pro-
vides air at precise conditions of temperature andhumidity and permits accurate variations of suchconditions at will, in the range of 34°F. to 1400F.;also below 320. if required.
This Method uses Hygrol" liquid absorbent to re-
move moisture from the air directly, saving the costof refrigeration for dehumidification. Operation isc-ompletely and reliably automatic; the absorbent isre-concentrated as fast as it is used.
It is used successfully in drying processes, controlof hygroscopic materias, preventing moisture dam-
age to materials or instru-
ments, providing con-trolled atmosphere for
tests and experiments.
Unilts provide capacityranges from 1000 c. f. m.to 20,000 c. f. m.
Write for Bulletin
No. 112; address NiagaraBlower Co., Dept. SW.
405 Lexington Avenue,
New York 17., N.Y.
I ,, J / I I EL
Yes, in spite of production cutbacks on non-military items, E. Machlett& Son can still offer you immediate delivery on the versatile Barcroft-Warburg Apparatus in both standard and refrigerated types. Designedespecially for study of micro chemical gas reactions, all our Barcroft-Warburg Apparatus possess many worthy features such as:
And in addition, the Refrigerated Barcroft-Warburg Apparatus hasa temperature range of 00 C. to 600 C. (+ 0.050 C). Refrigerating unitis neatly housed in cabinet which serves as a perfect base for the pre-cision apparatus.
Investigate the many laboratory applications of our Barcroft-WarburgApparatus. They may be precisely what your laboratory needs.
Act now, write E. Machlett & Son fordetailed descriptive literature today.
A 7 0fl2e2~'y APPARATUS A SUPPLIES ' CHEMICAIS220 EAST 23rd SmEET'E NEW YoR?K 10. N.Y.
.~~~~~~~~~
SCIENCE, Vol. 116
mass
spectrometer
model 21-201 lsotope-Ratio Mass Spectrometer, aspecial purpose instrumentfor measuring ratios of sta-ble isotopes in gases. 4
priced rightfor laborqtaorioeshaving moderate
analytical loads
II
model 21401 serves as a combinationanalytical and isotope-ratio mass spec-trometer.
CONSOLIDATED Model 21-401, the newest member of Consoli-dated's family of mass spectrometers, is a compact, medium-priceinstrument, ideal for those laboratories having moderate analyticalloads. It provides (1) automatically recorded mass spectra forquantitative analyses of gaseous or light-liquid mixtures, and (2)precise, recorded ratios of stable gaseous isotopes. Like the widelyused Model 21-103, it is exceptionally accurate and incorporatesmany automatic, time-saving features. For the multitude of indus-trial and scientific applications not requiring extremes of massrange, sensitivity, and operating speed, the Model 21-401 is ofmaximum value. Write for Bulletin CEC- 1 82 1.
Consolidated EngineeringC O R P O R AT I O N
300 North Sierra Madre Villa, Pasadena 15, California
Sales anid Service thirouighi CEC INSTRUMENTS, INC.a suibsidiary with offices in: Pasadena, Philadelphia,
Cfliic algo, Dallas.
ANALYTICAL SERVICE-here to serve you if youranalysis requirements do not justify the purchase of aninstrument. This precision analytical laboratory servicehas been operated at the Consolidated factory in -Pasa-dena since 1949-utilizing mass spectrometry underthe supervision of Consolidated's experienced staff. Forcost, handling of samples and other details, requestBulletin CEC-1813.
.\S
VT / proportionalcounters
by
a-x_A
NM_ OELP-
Total instrumental error is less than0.5%; the character of the "CandidDecade" scaling circuit guarantees thatscaling errors will not participate. Nogeometry or window error exists. Reso-lution loss 1% per 100,000 c/m.
The yield runs typically 5 to 50 timeshigher than an end-window GM counter.
Beta background runs less than 2 c/nper cm' of counting area; Alpha back-ground is less than 0.1 c/m.
Built-in automatic features reduce theoperating cycle to 4 rapid operations.
Less than 10 minutes is required to de-contaminate, clean and reassemble thecounting chamber.
The instrument counts Alphas, Betas andGammas. Alphas are counted with com-plete discrimination from high intensityBeta activity. Betas are counted in thepresence of Alpha activity.
Designed specifically for ProportionaiCounting with the least possible com-promise.
0
I
:' '6
p '*
0. S
II
I
You can depend on Instrumentsby Nuclear Measurements whenyou need Instruments forRADIOCHEMISTRY MINERAL ASSAY
_ W 7 \ 'RADIOBIOLOGY WATER & SEWAGE ASSAYRADIOTHERAPY NUCLEAR PHYSICS
_a I ~~~~~HEALTH PHYSICS MINIERAL SEARCNYAI& Lk'~~~7 HEALotac~ct NMC First
. . . For The Finest
2450 N. ARLINGTON * CH. 2415 * INDIANAPOLIS, INDIANA
and short wave-length)* Indicator Sprays* Disc Chambers* Solvent Troughs & As-
semblies* Micro Pipets
* Clips CHROMATOGRAPHY DRYING OVENWrite for Catalog
RESEARCH EQUIPMENT CORPORATION
Dept. S, 1 135Manufacturers
Third Street, Oakland 20, California
SCIFN-CE, Vol. 11 6
P H O T O V O L TRadiation-DetectionDensitometer Mod. 400-R
A self-contained densitometer for the accurate meas-urement of density of dental-size X-ray films as em-ployed in film badge systems for personnel monitoringin radio-activity laboratories and X-ray installations
Write for Bulletin #490 to $225.-
PHOTOVOLT CORP.95 Madison Ave. New York 16, N. Y.
Imr-qrysmr-9..I
.
'I"
Large stage moves up anddown for finer, faster focusing.
The PANPHOT combines permanentlyatigned microscope, camera and lightsource in one convenient unit.
asnpnhot, Universal Camera MicroscopeOnly the Leitz PANPHOT enables you to switch frommicroscopic observation to photo-micrography without movingfrom your chair, for it's the only universal camera microscope
with operating parts for both functions right at hand. Changeover from one to the other is fast,simple, dependable. Now available to industrial and technical laboratories, the PANPHOT isa perfect combination of research microscope and reflex camera.The PANPHOT permits the use of transmitted light, reflected light, darkfield illumination andpolarized light. The permanently aligned light source provides a filament lamp for observationand an arc light for photo-micrography.Easy observation of the image to be photographed is provided by a large ground glass in the reflexmirror camera. The camera accommodates 3y4"x 4X4" plates or cut film for black and white orcolor work.A full range of accessories is available to equip the PANPHOT for every phase of photo-micrography, photo-macrography and for drawing and projecting micro-images.
Write today for information to Dept. SC
E. LEITZ, Inc., 304 Hudson Street, New York 13, N. Y.LEITZ MICROSCOPES SCIENTIFIC INSTRUMENTS . LEICA CAMERAS AND ACCESSORIES
Septeniber 19, 1952 11
1.IiS liF +@,2iXP* = rEiNENL EXP
* * * S*0* _ 0 * * 0 0
~~~~~~~... .... ....w ,~~~1 _.............
....g s u a f i a
- E- ..... -.~~~~~~~~~~~~~~....--- .- .. :: sa.s
-.:0...
adds many years to the life of your Bausch & LombLaboratory Microscope. Entire fine focusingsystem floats on ball bearings and rollers ...
never binding, never drifting out of focus.
To this, and the many other long-lifemechanical features, is added the world's finest
