SCIENCE— ADVERTISEMENTS 



Marine Biological Laboratory 



WOODS HOLE, MASS. 



Biological Material 



1. Zoology. Preserved material of all types of animals for 

 class -work and for tlie museum. 



2. Embryology. Stages of some invertebrates, fishes (in- 

 cluding Acanthias, Amia and Lepidosteus), Amphibia, and 

 some mammals. 



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

 worts, Mosses, Ferns and Seed Plants. 



4. Microscope «lidea in Bacteriology, Botany and Zoology. 

 E. Life HUtories, Germination Studies, and Natural His- 

 tory Groups. Catalogues furnished on appUcation to 



GEORGE IW. GRAY, Curator 

 Woods Hole, Mass. 



The University Laboratory 



Designers 



AUSXANDEK StUTH, 



President 

 W. L. ESTABBOOEE. 



Gen. Manager and Sec'y. 



THOMAS B, FBEAS, 



Chief Designer and Trean, 

 W. A. BOBING, 



Cansnltiag AiCUtect 



This firm is prepared to offer consultation, 

 advice, report and design on chemicsl 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 Vanderbih Avenae, New York City 



OSCILLOGRAPHS 

 CARBON RHEOSTATS 

 WIRE RHEOSTATS 

 PRONY BRAKES 

 SAW TABLES 

 DRILL PRESSES 

 SPECIAL APPARATUS 



H. G. CRANE 



226 CYPRESS ST.. BROOKLINE, MASS. 



Teacliers "Wanted 



We have a great demeind for teachers in all depart- 

 ments of Science for Colleges, Universities and Agri- 

 cultural Schools. Sp>ecial terms offered for early 

 inquiries. Address — The Interstate Teachers' 

 Agency, Macheca Building, New Orlesms, La. 



FOR SALE: Jordan & Evermann, Fishes of North 

 and Middle America, 4 vols., CI. Autograph copy, 

 $16.00; Journal of Applied Microscopy, vols. 1-6, 

 CI., $15.00; Proceedings U. S. National Museum, 

 1879-1917,41 vols., CI., $25.00 ; Nutting's Mono- 

 graph on Hydroids, vols. 2-3. $4.00 ; Bryn Mawr 

 Biological Memoirs, 7 vols., paper, $8.00. Address, 

 F. B. Hanson, Washington University, St. Louis, 

 Missouri. 



LABORATORY ANIMALS 



Rabbits, Guinea Pigs, Rats, Mice, etc. 



Safe Arrival Guaranteed 



The Laboratory Animal Supply Co. 



Qarrlson, N. Y. 



WANTED 



A recent graduate in Science to teach 

 Physics to part-time classes in a large in- 

 dustrial plant. Reasonable salary to start. 

 Address Box X, care of "Science" Garrison, 

 N.Y. 



The Microscope 



12th Edition, Published April 10, 1917 



Ke-Written and largely Re-llluatrated 



By SIMON HENRY GAGE of Cornell UnWeraitr 



Postpaid $3.00 



COMSTOCK PUBLISHING CO., Ithaca, N. Y. 



Memrars 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 Institute 



Philadelphia, Pa. 



Scientific Survey of Porto Rico 

 and the Virgin Islands 



Published by the New York Academy of 

 Sciences 



Vol. I, part I — History of the Survey — 

 N. L. Bmtton. 

 Geological Introduction — 

 C. P. Berkey. 



Geology of the San Juan Dis- 

 trict — D. R. Semmes. 



Octavo, no pages, 4 plates, 26 text figures, 

 I geologic map. $2.00 



Vol. I, part 2 — Geology of the Coamo-Guay- 



ama District — E. T. Hodge. In Press. 



Vol. Ill, part I— Tertiary Fossils of Porto 



Rico — C. J. Maury. In Press. 



The completed series will comprise volumes on 

 Anthropology Palaeontology 



Botany Physiography 



Geology Zoology 



All communications should be addressed to 



Recording Secretary, New York Academy of 



Sciences 



77th Street and Central Park West 



New York City 



