SCIENCE— ADVERTISEMENTS 



The University Laboratory 

 Designers 



AliEXANDES SMITH, 



President 

 W. L. ESTABBOOKE, 



Gen. Manager and Sec*y, 



THOMAS B. FBEAS, 



Chief Designer and Treas. 

 W. A. BOBtNG, 



Consulting Architect 

 This firm is prepared to offer consultation, 

 advice, report and design on chemical lab- 

 oratories. Complete plans may be offered 

 or work may be done jointly with institu- 

 tional architect. Consultation with archi- 

 tects needing expert advice in laboratory 

 construction is solicited. Send for booklet. 



Office : 52 Vanderbilt Avenue, New York City 



Memoirs of the Wistar Institute of Anatomy and 

 Biology. No. 6, 1915 



THE RAT 



Data and Reference Tables. 278 Pages. 89 Tables. 



Bibliography. 

 Compiled and Edited by HENRY H. DONALDSON. 



Postpaid, $3.00. 



The Wistar Institate 



Philadelphia, Pa. 



OPTIC PROJECTION 



Principles, installation and use of the Mag'c Lantern, Opaque 

 Lantern, Projection Microseope and Moving Picture Machines 

 700 pages, 400 figs. By Simon Hbnbt Gage. B.S., and 

 Henbt Phelps Gage, PhJD. Poatpaid, $3.00. 

 THE COMSTOCK PUBLISHING CO., Ithaca, N.Yc 



MARINE BIOLOGICAL LABORATORY 



WOODS ROLE, MASS. 



BUologicaS Material 



1. Zoology. Preserved material of all types of animala 



for class work and for the museum. 



Z. Enibryoiogry. Stages of some invertebrates, fishes (in- 

 cluding Acanthias, Amia and Lepidosteus), Amphibia, and 

 some mammals. 



3. Botany. Preserved material of Algae, Fungi, Liver- 

 worts and Mosses. Price lists furnished on application to 

 GEOEGE M. GEAY, Curator, Woods Hole, Mass 



LABORATORY ANIMALS 



Rabbits, Guinea Pigs, Rats, Mice, etc. 



Safe Arrival Guaranteed 



The Laboratory Animal Supply Co. 

 Qarrison, N. Y. 



CannAV*oc Lcses 

 a III 6 F a. S forNaturali.ts 



Graflex, Kodak, Foreign Cameras, Zeiss, 

 Goerz, Cooke, and all other high grade Lenses 

 and Motion Picture Cameras. Save 25% to 507<,- 



C\i4 Our Prion Write at once for Com- 

 VJ« \J\U rrice pj^j^ catalog and month- 

 ly Bargain List. Experts on equipping expedi- 

 tions for still or Motion Picture work. Write 

 today to Graflex Headquarters of America. 



RA«^<^ CAMERA COMPANY 



h^£^hJ^ 109 E. Dearborn St. Chicago, 111. 



University of Msincbester 



John Harling Fellowship in Physics 



Value at least £175 



The object of the Fellovi'ship is the encouragement of Study 



and Research iu Phj'.sical Science. 



Particulars supplied on application to the Registrar of the 



University. 



I,ast Date for applications for the Fellowship, September 1st, 



1919. 



Fossil Reptilia 



Some excellent specimens of Jurassic Reptilia from 

 English Lies and Oolites for disposal. Full par- 

 ticulars with photographs from 



S. L. WOOD 



38 West Park Road, Kew Gardens, Surrey, England 



XH© Microscope 



12th Edition, Published April 10, 1917 



Re-Written and largely Re-IIIustrated 



By SIMON HENRY GAGE of Cornell UnWeraitr 



Poitpaid $3.00 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



JULIEN'S POWER LATHES 



COMPACT— ACCURATE— DURABLE 



Use of Geologists, Mineralogists, etc., in SLICING 

 and POLISHING all hard substances, rock, etc., and 

 in preparation of MICROSCOPIC THIN SECTIONS. 



GUSTAVUS D. JULIEN 



3 Webster Terrace NEW ROCHELLE, N. Y. 



Standard Apparatus of j 



New and Improved 



Designs 



Precision Measuring In- . , 



Reading Device for Ther- 

 StrumentS of great variety mometer«. Catalogue No. 



C1365, $2.00 



5345-5349 Lake Park Ave. Chicago 



