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NEW SERIES , NovEMBER 10 1939 SUBSCLIPTION, $6.00VOL. 90, No. 2341 FRiDAY, OEBR1,13 SINqGLE ComIE, .15

IMMEDIATELY

To the constantly growing list of successful Blakis-ton texts and reference books, we are glad to an-

nounce the addition of these two new books. Pub-lished May 1939, they have already been widelyadopted as classroom texts.

TEXTBOOK OF ORGANIC CHEMISTRY--

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PROMPTLY ADOPTEDBY 57 COLLEGES

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Illustrations 830 Pages $4.00

By E. WERTHEIM, Professor ofChemistry, University of Arkansas

"Salient facts are stated in a direct manner . . . Importantrelationships between compounds and reactions are emphasizedby cross references . . . Charts and summaries aid the initialstudy and facilitate review . . . Detailed flow sheets illustrateimportant industrial processes graphically . . . Portraits withbiographical sketches of chemists is an excellent innovation."

CHORDATE ANATOMY378 Illustrations 467 Pages $3.50

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NEW! 73ADOPTIONS ALREADY

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By H. V. NEAL, PH.D., Tufts College, andH. W. RAND, PH.D., Harvard University

"It is clear, concise, and well organized for a semester course. . . It correlates and interprets facts gathered in the labora-tory . . . Names of groups are defined in a brief discussion ofclassification . . . Illustrations are abundant and well labeled. . . Essential material for a clear understanding of racial his-'tory and physiology of the human body is presented."

THE BLAKISTON COMPANY, Philadelphia

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. 90, No.

TheFoundations of Science

By H. POINCARE

Pp. xi+ 553.

Containing the authorized En-glish translation by GeorgeBruce Halsted of "Science and

Hypothesis," "The Value ofScience" and "Science and

Method, " with a special prefaceby Poincare, and an introduc-

tion by Josiah Royce. Price,postpaid, $5.00.

THE SCIENCE PRESSGrand Central Terminal New York, N. Y.

Pure JeJ7aterFOR ALL

SCIENTIFIC PURPOSES

,/Stokes Stills produce pure distillate well-suited for all research orlaboratory purposes . . . water in which exceptional purity is safe.guarded by exclusive features of still design and construction. Theelectric model shown has Pyrex glass cover, gas eliminator, triplevapor baffle, solid tin condenser tube and funnel, deconcentrator forhard water service, chromium finish; is entirely automatic in opera-tion, safe, simple, rugged, long-lived; will make one gallon of puredistillate per hour. 22 stock models, to 100 gals. capacity;electric, gas or steam heating units; more than 18,000 in use. Seeyour dealer or write direct for catalog.

F. J. STOKES MACHINE COMPANY5958 Tabor Road Philadelphia, Pa.

LA MOTTE SULFAMIC ACID (Cryst.)° H Pure-Standardized

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11 \H practical application.O SOME OF ITS UNIQUE PROPERTIES

1. ColQrless, odorless, crystalline solid. (MeltingIPoint 2050 C.)2. Non-hygroscopic; soluble in water.3. Highly ionized (strongly acidic) in aqueous solu-

tion; approaching HCI and other strong mineralacids.

4. Forms stable salts and shows promise as newstandard in acidimetry.

5. Barium, Lead and Amine Salts, soluble in water.Full information Will be sent on request.

LaMotte Chemical Products CompanyDept. "H" Towson, Baltimore, Md.

Scientists, authors, lecturers, travelers and thou-sands of men and women in all walks of life havemastered a new language in their own homes bythe world famous LINGUAPHONE METHOD.. . . Amazingly simple, thorough, sound, no smat-tering. 27 languages available. Send For FREEBook.

LINGUAPHONE INSTITUTE89 B.C.A Building New York City

Hugh Miller's

History and ScienceA Study of the Relation of Historical

and Theoretical Knowledge

An important contribution to currentphilosophical controversy. The auth-or's theme is that theory and historyare everywhere two complementary ap-proaches to natural knowledge and thateach is equally of general application.

Price, cloth, $2.00

Order through your bookseller,or direct from

THEUNIVERSITY OF CALIFORNIA PRESS

BERKELEY:: CALIFORNIA

Typical Analysis, CertifiedParts per 100,000

Total Solids 0.28Volatile Solids 0.16Inorganic Solids 0.12Nitrogen as

Free Ammonia 0.0035Album. Am. 0.0000Nitrites 0.0000Nitrates 0.00

Chlorine 0.00Bacteria per cc. none

2 SCIENCE-ADVERTISEMENTS VOL. 90, NO. 2341

NOVEMBER 10, 1939 SCIENCE-ADVERTISEMENTS 3~~~~~~~~

A Microscope for the PATHOLOGISTE QUIPPED with an additional low-power ob-

jective, this Spencer Microscope No. 11, withits wide-field eyepieces, enables the pathologist toscan large specimens in order to find more readilythe area which he wishes to scrutinize under highmagnification.The quadruple revolving nosepiece accommodatesthe regular 16 mm., 4 mm. and 1.8 mm. objectivesin addition to the new 3.5X low-power unit.This instrument can be equipped for dark field workby the addition of the Spencer Dark Field Condenser.For complete information, write Dept. Y1.

Spencer Lens CompanyMICROSCOPES REFRACTOMETERSMICROTOMES COLORIMETERSPHOTOMICROGRAPHIC | urrALu SPECTROMETERSEQUIPMENT K A PROJECTORS

NOVEMBM 10) 1939 SCIENCE-ADVERTISEMENTS 3

4 SCIENCE-ADVERTISEMENTS

EHEASTERN PREBULON LABORATORY APPARATUS0 Precision Temperature

Regulator 7Accurate to 1/50 degree C. A perfect thermo-regulator for Ovens. Incubators, Water lBaths,Organic Reaction Mixtures and general labo-ratory service. Tenmperature range up to300 C. Va por-mercury heat sensitive ele-ment. Easily set and adjusted. Completewith relay, 2 extr'i bulbs and mercury. Guar-anteed. Price $18.50 F.O.B., New Haven, Conn.

* Miget Laboratory PumpPerformance Equal to Many Larger Pumps

PORTABLE-INEXPENSIVE-ACCURATE MODELS

These pumps are precision built for all laboratory require-ments and small scale plant operations.Type-Centrifugal. Size-5" x 2.Y-" x 3l,A". Weight-2%4 lbs.Power-MODEL "A", '/ioo H.P....MODEL "B", 1/20 H.P.

Identical in Size.MODEL "A" 115 Voolt8A.G. 115 Volt8 D.C.Maximum Pressure 10 pounds 12 poundsMaximum Capacity 5 gals. per min. 6 gals. per min.MODEL "B"-115 Volts A.C. or D.C.Max. Pressure-20 to 30 lbs. Max. Cap.-8 gals. per min.

Complete with 115 A.C. or D.C. MotorModel Bronze Monel Stainles8 Steel"A" $18.50 $21.50 $21.50"B" 21.50 21.50 24.50WRITE FOR DESCRIPTIVE FOLDER 0

EASTERN ENGIl38 FOX STREET

NEERING COMPANYNEW HAVEN, CONN.

I INDICATORSThe Coleman & Bell Company

manufacture a complete list of in-dicators including all of the com-mon indicators used in analyticaland biological work, the hydrosen-ion indicators recommended bySorensen and Clark & Lubs, and inaddition many rare indicators suit-able for special work. These indi-cators are available in both thedry form and in solution, ready touse. Certain indicators are offeredin the form of Test Papers in vialscontaining 100 strips, and in sheets2" x 10".

Catalogue of Laboratory Reagents upon Request

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TyOUR needs for apparatus employing highpressures and temperatures for the investi-

gation and utilization of catalytic chemical re-actions and other phenomena can be met suc-cessfully by Aminco technlilans. A special shopdepartment is maintained for producing designsin high-strength materials for all phases of su-perpressure technique.

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HydrogenationApparatus

We are well equippedto suxpply completeapparatius for the 4synthetic hydrogen-ation of organicsubstances.

4 SCIENCE-ADVERTISEMENTS VOL. 90, No. 2341

In kiIllillil'on11PICIM11MMAXI

NOVEMBER 10, 1939 SCIENCE-ADVERTISEMENTS 5

Recognized for their great mechani-cal strength and their proved ability towithstand repeated sterilization (wet or

dry) "Pyrex" brand Pipettes are now navailable withi LIFETIME RED-the '%permanent graduation. g

These new Pipettes of "Pyrex" brandBalanced Glass are now available throughyour Laboratory Supply Dealer, at the same pricesas regular "Pyrex" Pipettes. There are two new W 'F EYE t' E Beditems-No. 7063, a Measuring Pipette (Mohrl

Serological~~ ~ ~ ~ ~ ~ ~ ~~~erann Graduanationpste

Type) of the design as recommended by theChemae GrduatiosWith LIFETIME RED, theNational Bureau of Standards (Circular No. 9), scale and figures are machineengraved and acid etchedand No. 7083, a Serological Pipette designed to through a permanent redconform withFeeral Specificatons DD-V-581. ayer into clear glass. No fillerconform ithFedeal SpeciicationsDD-V-58 is nece8sary. Greater lgbl

Both are accurately calibrated with tips having iyadpraetmriggradual taper and stone finish. Properly balanced When It's RED-It's Easily Readfor convenient handling. No. 7063 is available aeasrdin sizes from 1/10 ml to 25 ml; No. 7083 from1/10 ml to 10 ml. Send for new folder giving fullcatalog information on "Pyrex" brand Measuring,Serological and Transfer Pipettes. Visit us at Chemical industries Expo.,

Spaces, 332.-333, 346.- 347, GrandCORNING GLASS WORKS * CORNING, N.Y. Central Palace, N. Y. City, Dec. 4.9.Send me your new Folder on "Pyrex" brand Pipettes. (Form F.132)

NAME COMPANY OR INSTITUTION

TITLE OR POSITION ADDRESS

NovizmBER 10, 1939 SCIENCE-ADVERTISEMENTS 5

6 CEC-DETSMNT o.9,N.24

Glass electrode potentials are measuredacculritely on a Type K Potentiometer

A convenient pointer galvanometer iseasy to read and speeds up operation

Titrations are made without polarizingthe electrodes. Only 2 x 10-1 amp flows

The Thermionic Amplifier is a unit inthe Electro-Chemograph Assembly

Adapt Your Present PotentiometerTo Glass Electrode MeasurementsWith A THERMIONIC AMPLIFIER

Glass electrode potentials can now be measured with ordinarypotentiometers by simply adding to the circuit this ThermionicAmplifier. It magnifies potentiometer unbalance to such an ex-tent that, in spite of the high electrode resistance, sensitivity isadequate. The Thermionic Amplifier is simple to operate and isfrequently used for routine testing.The amplifier and potentiometer can also be used to measure

potential in other high resistance circuits without drawing anappreciable current.We will be glad to discuss the application of this amplifier to

any specific problem you may have in mind.Catalog E.OOA gives further information

7673 THERMIONIC AMPLIFIER .$.1.5. . . . . St65.00Practical limit of sensitivity, 0.0001 volt.Control (electrode) current adjustable (with accessory checkresistor) to less than 101 amp. at balance. Error due to thiscurrent is less than 0.0001 volt per 10,000 megohms.

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LEEDS & NORTHRUP COMPANY,4926 STENTON AVE, PHILA., PA.

Measuring Instruments. Telemeters . Automatic Controls . Heat Treating Furnace

6 SCIENCE.-ADVERTISEMENTS Vou 90, No. 2341

VOL. 90, No. 2341

tion to remove waxy and oily -films, and provided thefour or five perforations in each bulb are approxi-mately the same size. The glass tubing used for themain water lines should be about 9 mm outside diam-eter, while leads to the individual towers may besmaller in diameter or about 7 mm outside diameter.The bulbs, one of which is described at K, can be

made easily without special technique in glass blowing.The following procedure is suggested: Heat the endof a five-inch glass tube which is approximately 7 mmin diameter until it has sealed; remove from the flameand blow immediately a bulb on the end, which isabout one half inch in diameter. Allow to cool; heatagain one side of the bu.b and blow a pimple. Heatanother side at a right angle to the first; blow anotherpimple and with a file gently file two holes at thesepoints. The last two or three holes can be madequickly by inserting a rigid wire through the first holesand pushing out pimples on individually heated sidesof the bulb, as shown at E. These pimples are filedoff and the holes fire-polished.

Sometimes difficulty is encountered with loss of solu-tion by bubbling over the tops of the towers, espe-cially when about two drops of n-butyl alcohol5 havebeen added to every 100 cc of alkali solutLion to increasethe number of bubbles and decrease their individualsize. When the solution in a tower threatens to over-flow at the beginning of a run, this may be checked byremoving the rubber tubing at 0 and with a medicinedropper allowing about two drops of capryl alcohol tosettle to the base of the bulb. Capryl alcohol has thereverse effect of butyl alcohol on surface tension.When a mass of bubbles strikes the bulb, the foamimmediately falls back.The diagram at Q demonstrates how the rubber tub-

ing on the two arms of a flask may be sealed fromoutside air before and after it is attached to the ap-paratus. This eliminates the expense and awkwardnessof pinch-clamps. The three-inch glass tube, R, shouldbe inserted further in the rubber tubing of arm 1 thanarm 2. It thus will consistently, pull out of arm 2more easily than arm 1, and will be ready for therubber connection, S.

N. F. CHILDERSD. C. KIPLINGERH. W. BRODY

OHIO AGRICULTURAL EXPERIMENT STATION,OMO STATE UNIVERSITY

A NEW CULTURE MEDIUM FOR PARAMECIAVARIous devices have been suggested for slowing

down and entangling Paramecia for microscopic study.The most satisfactory appears to be the addition of asmall amount of fine cultural debris to the drop ofmedium on the slide. Cultures made up of hay infu-

5 M. D. Thomas, Ind. Eng. Chem., Anal. Ed., 5: 193-8,1933.

sions contain relatively little fine material. In orderto increase the amount of fine debris we use the fol-lowing method of raising Paramecia. 0.2 gram"Pablum" (an infant food manufactured by MeadJohnson and Company) is added to 400 cc of tapwater in a wide mouth pint jar. This is covered byan inverted glass coaster and autoclaved at 15-20pounds steam pressure for 30 minutes. After the mix-ture has cooled it is inoculated with Paramecia andallowed to stand at room temperature. In a week'stime a dense culture of Paramecia is obtained. The"Pablum" concentration given above seems to beoptimum.To dispense the Paramecia to students we usually

stir up the contents of a culture jar for a uniformdistribution of Paramecia and fine cultural debris. Onmicroscopic examination we find that most of the Para-mecia are feeding and therefore easier to study. Whengreater concentrations of Paramecia are desired on aslide an unagitated drop of medium from the surfacewhere the Paramecia aggregate, together with a smallamount of debris from the bottom, may be used. Ordi-narily one such culture as described above suffices fora hundred or more students.

BERTIL GOTTFRD ANDERSONBIOLOGICAL LABORATORY,WESTERN RESERVE UNIVERSITY

BOOKS RECEIVEDBOARDMAAN, EDWARD T. Field Guide to Lower Aquarium

Animals. Pp. 186. 51 figures. Cranbrook Instituteof Science, Bloomfield Hills, Michigan.

CALEY, EARLE R. The Composition of Ancient GreekBronze Coins. Vol. XI, 1939 of the Memoirs of theAmerican Philosophical Society. Pp. viii + 203. Illus-trated. The Society, Philadelphia.

Collected Letters of Antoni van Leeuwenhoek, Part 1.Edited by a committee of Dutch scientists. Pp. 454.39 plates. Swets and Zeitlinger, Amsterdam.

EGE, VILH. A Revision of the Genus Anguilla Shaw.Pp. 256. 53 figures. 6 plates. Carlsberg Foundationand Oxford University Press, London.

MACR, JULIAN E. and MILES J. MARTIN. The Photo-graphic Process. Pp. xvii + 586. Illustrated. Mc-Graw-Hill. $5.00.

STENGER, ERICH. The History of Photog-aphy; Its Re-lation to Civilization and Practice. Translation fromthe German by EDWARD EPSTEAN. Pp. xiv + 204.Mack Printing Co., Easton, Pa.

TANSLEY, A. G. The British Islands and their Vegeta-tion. Pp. xxxviii + 930. 416 photographs, 179 figures.Cambridge University Press, Macmillan. $16.00.

THURSTON, ROBERT H. A History of the Growth of theSteam-Engine. Pp. xii + 555. 182 figures. CornellUniversity Press, Ithaca, New York. $3.00.

TURNBULL, HERBERT W., Editor. James Gregory; Ter-centenary Memorial Volume. P. xi+ 524. Illustrated.G. Bell and Sons, London. 25s.

WHYTE, R. 0. Research on Grassland, Forage Crops andthe Conservation of Vegetation in the United States.Herbage Publication Series, Bulletin 26. Pp. 113.Imperial Bureau of Pastures and Forage Crops, Ab-erystwyth, Great Britain. 5s.

WINKLER, JOHN K. and WALTER BROMBERG. Mind Ex-plorers; the Story of Mental Healing. Pp. 378. Rey-nal and Hitchcock. $3.00.

448 SCIENCE

SCIENCE-ADVERTISEMENTS

Four Distinctive New BooksINTRODUCTION TO CHEMICAL PHYSICS

By J. C. SLATER, Massachusetts Institute of Technology. International Series in Physics.521 pages, 6 x 9. $5.00

In this unified presentation of material common to the fields of both physics and chemistry, theauthor offers a treatment of thermodynamics and statistical mechanics, including their applicationto solids, liquids, and gases. There is also a discussion of atomic structure and the resulting inter-atomic and intermolecular forces, with application to the different types of chemical substances, andto their thermal and mechanical properties.

ELECTRONIC STRUCTUREAND CHEMICAL BINDING

By OSCAR K. RIcE, University of North Carolina. 485 pages, 6 x 9. $5.00This book is essentially a discussion of the chemical bond as exemplified in inorganic compounds.Its purpose is two-fold: (1) to lay a foundation in atomic physics of the depth and scope likely to bemost useful for chemists in general, and capable of being used as an introduction for those whoexpect to specialize more particularly in the field; and (2) to classify, on the basis of this founda-tion, the chemical compounds, and to discuss numerous problems in chemistry having to do especiallywith the nature of chemical binding.

LECTURE DEMONSTRATIONSIN GENERAL CHEMISTRY

By PAUL ARTHUR, Oklahoma A. & M. College. International Chemical Series. 483 pages,5j x 8. $4.00

Here is a complete laboratory manual for the lecture demonstrator. Containing instructions formore than 1000 experiments, grouped under 175 topical headings, the book covers every phase ofwork normally shown in general chemistry. Full instructions are given in every case, and the bookis designed for use with any standard text.

PRINCIPLES OF SEDIMENTATIONBy W. H. TWENHOFEL, University of Wisconsin. 610 pages, 6 x 9. $6.00

The purpose of this important book is to present a comprehensive discussion of the sources of sedi-ments; the environmental factors that influence their production, transportation, and deposition;the various methods by which sediments are transported from source to site of deposition; the differ-ent products which result from operation of sedimentary processes; and the structures which ariseas a consequence of deposition.

Send for copies on approval

330 West 42nd Street, New York, N. Y..McGRAW-HILL BOOK COMPANY, INC.

NovEmBEu 10, 1939 7

Aldwych House, London, W.C.2

NOVEMBER 10, 1939 SCIENCE-ADVERTISEMENTS 9

Enthusiastically praised . . 0

EXPERIMENTAL PSYCHOLOGYRobert S. Woodworth, Columbia University

"It is astonishingly complete in its coverage, remarkably well balanced in its distribution of attention toall the topics of the conventional field of 'experimental psychology,' and as unbiased and fair a reviewas seems humanly possible. For a teacher of a course in 'experimental' it is an answer to prayer."John F. Dashiell, University of North Carolina.

Price, $3.80

QUALITATIVE ANALYSIS ANDCHEMICAL EQUILIBRIUMT. R. Hogness and W. C. Johnson

University of Chicago"The book appeals to me as being much the besteffort so far to reduce amounts of material inelementary inorganic qualitative analysis, with-out getting into the more specialized micro meth-ods." R. D. Cool, University of Akron.

$2.75

PRINCIPLES OF DEVELOPMENTA Text of Experimental EmbryologyPaul Weiss, University of Chicago

"In my opinion this is an excellent text for ad-vanced work in Embryology. Professor Weisshas treated the subject with penetrating analy-sis, and his concise system of selecting examnpleexperiments to illustrate principles serves tosimplify the subject for the student." D. M.Wliitaker, Stanford University.

Illustrated with fine pictures,drawings and photographs

$5.oo

HENRY HOLT AND COMPANY, 257 Fourth Avenue, New York

MIATNiUAL OF TIIESOUTHEASTERN FLORA

ILLUSTRATED

Being Descriptions of the Seed-Plants growing naturally In North Carolina, South Carolina,Georgia, Florida, Alabama, Mlssissippi, Tennessee and Eastern Louisiana

By

JOHN KUNKEL SMALL

THIS Manual replaces the author's Flora of the Southeastern United States,published, in 1903 (second edition 1913), for the Southern States east of the

Mississippi River. It embodies the results of continued exploration and study,thus bringing up to date our knowledge of this floral region.

The Manual is the only complete illustrated work on the flora of the South-east by a recognized authority.

In addition to analytical keys to the various plant groups, and descriptionsof the orders, families, genera and species, regional or altitudinal and geographicdistribution, there are xxii + 1554 pages and over 1500 illustrations, one illustra-tion of a species of each genus.

Price $10.50 Postpaid

THE SCIENCE PRESS PRINTING COMPANYLANCASTER, PENNSYLVANIA

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NovzxBzi& 10, 1939 SCIENCE-ADVERTISEM-ENTS .9