SCIENCE-ADVERTISEMENTS 



Marine Biological Laboratory 



Woods Hole, Mass. 



INVESTIGATION 

 Eatir* Year 



INSTRUCTION 



July 3 to August 13 



SUPPLY 

 DEPARTMENT 



O^en thm Entire Year 



Facilities for research in Zoology, 

 Embryology, Physiology and Bot- 

 any. Seventy-flii private labora- 

 toriea. SlOO each for not over three 

 months. Thirty tables are avail- 

 able for beginners in research who 

 desire to work under the direction 

 of members of the staff. The fee 

 for such a table is $50.00 



Courses of laboratory instruction 

 with leottires are offered in Inverte- 

 brate Zoology, Embryology, Physi- 

 ology and Morphology and Taxo- 

 nomy of the Algae. Each course 

 requires the full time of the student. 

 Fee, S50. A lecture oourse on the 

 Philosoi>hical Aspects of Biology 

 and AUied Sciences is also offered. 



Animals and plants, preserved, Uv- 

 ine, and in embryonio stages. 

 Preserved material of all tTPes of 

 animals and of Algae, Fungi, Liver- 

 worts and Mosses furnished for 

 olasawork, or for the museum. 

 Livine material furnished in season 

 as ordered. Price liets of Zoological 

 md Botanical material sent on ap- 

 plication. State which is deored. 

 For price Usts and all information 

 regarding material, addreat 



GEO. M. GRAY. Curator, Woods Holt. Maoi. 

 tb» umnal annomoemeBi vill be sen 4 on application to The 

 I3&eotoT. Marine Biolo^oal Laboratory, Woods Hole* Mass. 



Northrup Alternating 

 Current Galvanometer 



Described In Circular No. 7 



Pyrolectric Instrument Co. 



148 E. state St. 



E. F. Northrup, Pr 



Trenton, N. J. 



sident and Technical Adviier 



OPTIC PROJECTION 



3ftmciples, matallation and use of the Mag'C Lantern, Opaque 

 Eantem. Projection Microsoope and Moving Picture Machine; 

 TSO pages, 400 figs. By SiuoK Henbt Gaob, B.S., and 

 Hbnbi Phelps Gage, Ph.D. Postpaid, $3.00. 

 THE COMSTOCiCPUBUSHING CO., Ithaca, N Y. 



Teachers Wanted 



We have a steady demand for men in all depart- 

 mentg of Science for Agrionltnral Colleges, and Uni- 

 Yeraities. Special terms. Address 



The Interstate Teachers' Agency 



Macheca Bide:. New Orleans, La. 



The Ellen Richards Research Prize 



The Naples Table Association for Promoting 

 Laboratbry Research by Women announces the offer 

 o£ a research prize of $1000.00 for the best thesis 

 written by an American woman embodying new ob- 

 BOrvations and new conclusions based on independent 

 laboratory research in Biology (including Psy- 

 chology) , Chemistrv or Physics. Papers published 

 before 1916 will not be considered and these pre- 

 Bented for a Ph.D. degree are not eligible. Theses 

 offered in competition must be in the hands of the 

 Chairman of the Committee on the Prize before 

 February 25, 1919. Application blanks may be ob- 

 tained from the secretary, Mrs. Ada Wing Mead, 

 823 Wayland Avenue, Providence, R. I. 



ROMEIKE'S 



PRESS CLIPPINGS 



are now an absolute necessity for every scientific 

 man. By methodical searching through the most 

 important papers and periodicals published in this 

 country and abroad we are able to supply you at 

 short notice with information on any subject which 

 perhaps you would be unable to find yourself in 

 libraries or reference books after spending days or 

 even weeks at such a task. Write for further infor- 

 mation. 



HENRY ROMEIKE, Inc. 



106-110 Seventh Avenue New York City 



Flora of the Rocky Mountains 

 and Adjacent Plains 



By PER AXEL RYDBERG, Ph.D. 



Cuiator in ihe New York Bolanical Caidcn 

 8vo 3cii-f-1110 pages 1917 



Contains descriptions of the native and naturalized 

 Flowering Plants and Ferns of Colorado, Wyoming, 

 Montana, Saskatchewan, Alberta, Idaho, Utah, the 

 western counties of Nebraska, South Dakota and 

 North Dakota and the Kootenay districts of British 

 Columbia. 



Published by the author. Price $3.75 net. 

 3304 Rochambeau Avenue New York City 



