SCIENCE-ADVERTISEMENTS 



Marine Biological Laboratory 



Woods Hole, Mass. 



INVESTIGATION 



Entire Year 



INSTRUCTION 



July 3 to August 13. 

 1918 



Facilities for rescach in Zoology, 

 Embiyology, Physiology and Bot- 

 any. Seventy-six private labora- 

 tories, $100 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 instiuction 

 with lectures are offered i n 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. Alecture course on the 

 Philosophical Aspects of Biology 

 and Allied Sciences is also offered. 



Animals and plants, preserved, Hv- 

 i ng, and in embryonic stages. Pre- 

 served material of all types of 

 animals and of Algae, Fungi, Liver- 

 worts and Mosses furnished for 

 classwork, or for the museum. Liv- 

 ing mateiial furnished in season 

 as ordered. Price lists of Zoological 

 and Botanical materia 1 sent on ap- 

 plication. State which ia desired. 

 For price lists and all information 

 regarding material, address 



GEO. M. GRAY, Curator, "Woods Hole, Mass. 



The annua ] announcement will be sent on application to The 

 Director, Marine Biological Laboratory, Woods Hole, Mass. 



SUPPLY 

 DEPARTMENT 



Open the Entire Year 



A DICTIONARY FOR 

 EVERY LIBRARY 



GOULD'S 



MEDICAL 



DICTIONARY 



(THE PRACTITIONER'S) 



Flexible Cloth, Marbled Edges, Q^ 7 c 

 Round Corners <>^./«) 



(With Thumb Index $3.25) 



71,000 Words 



Pronunclation--Definitlen— Derivation 



Includes many of the words of allied 

 sciences 



P. BLAKISTON'S SON & CO. 



Publishers PHILADELPHIA 



REVISION OF THE RODENT GENUS 

 APLODONTIA 



By Walter P. Taylor $.75 



The Subspecies of the Mountain Chickadee, by Joseph Grin- 

 nell 15 



Excavations of Burrows of the Rodent Aplodontia, with 

 Observations on the Habits of the Animal, by Charles 

 Lewis Camp 20 



The Growth of Normal and Hypophysectomized Tadpoles 

 as Influenced by Endocrine Diets, by P. E. Smith 15 



Yariability in Soils and its Significance to Past and Future 

 Soil Investigations. I. A Statistical Study of Nitrifica- 

 tion in Soils, by Dean David Waynick 30 



The Registration of Earthquakes at the Berkeley Station 



At the Lick Observatory Station 



from 

 April 1, 1917, to September 30, 1917, by E. F. Davis 25 



The University of California issues publications in the follow- 

 ing series among others : Agricultural Sciences, American 

 Archaeology and Ethnology, Botany, Economics, Entomology, 

 Geography, Geology, Mathematics, Pathology, Physiology, 

 Psychology, Zoology, Memoirs of the University of California, 

 BuUetina and Publications of the Lick Observatory. 



Complete lists of titles and prices will be sent on request 



UNIVERSITY OF CALIFORNIA PRESS 

 Berkeley, California 280 Madison Avenue, New York 



GAS-GAS 



The "Detroit" 

 Combination Gas Machine 



Automatically metkes the best 

 and cheapest gas for 



Laboratory Uses of Every Character 



Heating — Cooking — Lighting 



Over 30,000 in daily use 



rtfiUee catalogue and name: o/ oj 

 locality sent on requesl 



in you 



THE Detroit heating & 



LIGHTING CO. 



612 Wight St. Detroit, Mich. 



EBtablished 1868 



