SCIENCE--ADVERTISEMENTS

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THE TaiL? RESEARCH LABORATORIE

w~TB a s TT yPCResearch in ManufacturingPharmaceuticals and Biologicals

Every step in the manufacture of phar- Chemical and physiological assays atemaceutical and biological pructs cas for neces to stad hd p .sientific supervision. The manufacture of antitoxins, vacanes and

Crude vegetable drug must pass botani- biologicals used in medical practice reqcal inspection; chemicaltests and assays are the knowledge and skill of those trained inalso needed to make certain that materials chemical, physiological and bacteriologicalused in manufacturing are of the proper sciences.identity and quality. In addition to maintg a staffor scd.

Research work is carried on all the year entific supervision of manufacturng pro.in the laboratories at Indianapolis and cesses, years ago we saw the necessity ofGreenfield, Indiana. During the summer organizing a research department for thea branch is maintained in the Marine Bio. improvement ofestablished preparations andlogical Laboratories, Woods Hole, Massa- the development of new medical products.chusetts, for investigations involving marine The building pictured above is devoted en.forms. tirely to scientific work.The Lilly Research Laboratories are equipped for work in synthetic chemistry,

physiological chemistry, physiology, pharmacology, bacteriology and immunology.On account of experience in industrial chemical research, we are especially pre-pared to undertake the problems of turning purely scientific discoveries to practicaluse. Our research staff cooperates with investigators in universities and clinics

ELI LILLY AND COMPANYINDIANAPOLIS, INDIANA, U. S. A.

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SCIENCE-ADVERTISEMENTS

LANCASTER, PENNSYLVANIA

1UC W s "

Col. Whelen soys " he will invariably choose the 7 powerhirakel when compared with standard 6 and 8 power glasses

y5RAKte Buy Good BinocularsV,T, PO,.C. The new 7-Power Mirakel weighs only

*_OCaLAW5 oz. Can be carried in vest pocket orladies' bag. A wonderful high-gradelPrism Binocular for every use ...... $35Hensoldt New "Dialyt"-6x30-13 oz. $58Zeiss Wide-Angle 9De1trentis"-8x30. $66Prismiris Pocket Binocular, 6 Power,

12 oz. prism.......... $16Compass-Engineer's and Sportsman's; Floating Dial. $3.50Fiala Sleeping Bag-Scientifically Correct-Warm LightWeight-Sanitary. Best for Outdoor Sleeping ...... $e5

Fiala "Llama" Wool Bag: 3% lbs ...... $30Canoe Sponsons: portable; adjustable; wt. 1 lb. each.

pair $10

Scientific, Exploring, Camping Outfits-Write for Catalog A

ANTHONY FIALA, 25 Warren St., New York

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BECBROLABORATORY RHEOSTATS

Screw Adjustment Type

"BECBRO" Rheostats carried in stock Include nunmerous different ratings.Included in the stock sizes are tubular types of lengths 20"; 16"; 8"; the resistance element being

Wire or Ribbon.Each tube has a slider adjustment which varies the resistance by very small steps from Zero to total

value of the unit.The approximate total resistance of these stock rheostats varies from 0.3 ohm to 30,000 ohms per unit,

and have corresponding current capacities of 25 amperes down to 0.1 ampere.

Rheostats of more or less special construction include the Single .Tube equipped with two rods and

two sliders; Single and Double Tube equipped with Screw Adjustment (see cut); Double and Triple Tubes

mounted as a Unit; Non-Inductive Wound Tubular and Stone Types." BECBRO " Carbon Compression Rheostats with corresponding Normal Ratings of 250: 1000: 1500:

3000 Watts.Write for Catalog S-20

BECK BROS.421 Sedgley Ave. Philadelphia, Pa.

LIVING BULLFROGSSafe delivery guaranteed

Teach Biology with live specimens where practicableWe have the only complete live materials

establishment in America. Live plants andanimals representing all types are kept on handunder semi-natural conditions at all seasons.Also headquarters for preserved specimens

of all types, microscopic slides, life histories,demonstrations, osteological preparations, in-sect collections. We specialize in many impor-tant southern species not obtainable elsewhere.

All material guaranteed without reservations.SOUTHERN BIOLOGICAL SlUPPLY CO., INC.,

Natural History Building, New *rleans, La.

THE SCIENCE PRESSPRINTING COMPANY

PBINTEBS OF

SCIENTIFIC AND EDUCATIONAL JOURNALS,

MONOGRAPHS AND BOOKS

Corre.pondeue Invted

By means of sliding-contacts the resistance value of

JAGABI RHEOSTATScan be varied from zero to full rating in exceedinglysmall steps.They are eminently suited for, and are largely usedIn Educational, Research and Industrial Laboratories.

Write for itlhltat.id Bulletin 1140-S

JAMES G. BIDDLE, PHILAItLPHIA1211-13 ARCH STREET

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SCIENCE-ADVERTISEMENTS xiii

CZQ)hat the little "S"in

the Weston Cataloguemeans to Youu. .. .

pRACTICALLY, it means the largest and mostdiversified line of models and ranges offered

by any instrument manufacturer anywhere in theworld.

A stock of instruments that has been carefully andscientifically developed over a long period of timebased on the actual buying habits of the electricalindustry-that'^r selection.

Speedy delivery. So important when you want im-

mediate shipment of an instrument to meet a specialrequirement. In nine cases out of ten we have theexact model and range ready to ship direct fromstock-that'f service.

Made to standard specifications. Thorough Westoncraftsmanship embodied in all designs and construc-tional features. These instruments are built on our

own time-for your special convenience--that's satis-faction.All told, it means savings. Standardized stock in-

struments not only mean a saving in time for you,

but are usually less expensive than instruments ofspecial specifications andranges. Consult the WestonCatalogue and you will in-

variably find marked with a

little "S" an instrument thatwill exactly suit your re-

quirements.

EXECUTIVE BIOLOGIST, Ph.D., ZOOLOGIST-18

years' various zoological research experience, 16 years'

teaching, knowledge of cytology and protozoology,

desires to improve position. Address "G. F.," care of

The Science Press, 3939 Grand Central Terminal, New

York, N. Y.

Ph.D., ZOOLOGIST-Desires position in MEDICALSCHOOL to teach microscopic anatomy and to studygross anatomy, eventually to teach in either branch.Graduate of three American Universities; studiedabroad, one year. Well grounded in vertebratezoology and cellular biology. Address "This Fall,"care of The Science Press, 3939 Grand Central Ter-

minal, New York, N. Y.

THE MICROSCOPEBy SIMON H. GAGE, of Cornell UniversityRevised, Dark-field Edition (1927) now Available.

The Old and the New in Microscopy, with a special chapteron Dark-Field Methods and their Application.

Postpaid, $3.50

COMSTOCK PUBLISHING CO., ITHACA, N. Y.

Marine Biological LaboratoryWoods Hole, Mass.

SUPPLY Biological Suppliesn.PARTMENT

Open the EntireYear

For the classroom, museum or col-lector.

Look for the sign of the Limulus.As the Limulus represents the testof time, we feel from the businessgrowth that our supplies have alsostood the test of years.

Send for CatalogueNo. I. Zoological and Embryolog-ical material. Life Histories andHabitat Groups.No. II. Botauical material.No. III. Microscopic Slides.

Address all correspondence regard-ing material and catalogue to:

Supply Department

£rt'n Tr frDAV (rnnr

WESTON ELECTRICAL 1o

INSTRUMENT CORPORATION, Woods Hole, Mass.585 Frelinghuysen Ave.,Newark, New Jersey Model 528 A. C. Portables MIDm

Newar, Hfy-Speed Mixers gClamp to any tank, operate from

~ rRlightcircuit, mix all kinds of liquids.

//z*11W)U*J Also used for even temperature

PIONEERSXgN I baths. Thousands in use.

from Write for circular.SINCE 1888 1/10 P. ALSOP ENGINEERING

INS RUM4m . .e. TS $37.50 UP

Second Edition: Rtevised and Enlarged

THE RAT: DATA AND REFERENCE TABSMemoir No. 6: 548 Pages. Bibliography: 2206 Titles

HENRY H. DONALDSONPublished by THE WISTAR INSTITUTE

Philadelphia, Pa., U. S. A. Price, $5.00,

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SCIENCE-ADVERTISEMENTS