SCIENCE-ADVERTISEMENTS 



IMPORTANT BOOKS IN SCIENCE 



By Jacques Loeb, Member of the Rockefeller In- 



Artificial Parthenogenesis and Fertilization, 



stitute for Medical Research. 



This new work presents the first complete treatment of the subject of artificial parthenogenesis in English. It gives 

 an account of the various methods by which unfertilized eggs can be caused to develop by physico chemical means, and 

 the conclusions which can be drawn from them concerning the mechanism by which the spermatozoon induces development. 

 Since the problem of fertilization is intimately connected with many different problems of physiology and pathology — we 

 need only mention the natural death of the egg cell and the prolongation of its life by fertilization; the fertilization of the 

 egg by foreign blood and the immunity of the egg to blood of its own species; the relations between heterogeneous hy- 

 bridization and artificial parthenogenesis, between fertilization and cytolysis, and between permeability and physiological 

 efficiency of acids and bases, etc.— the bearing of the facts recorded and discussed in the book goes beyond the special 

 problem indicated by the title . 



318 pages, 12mo, cloth; S2.50, postage extra (weight 36 oz.) 



Animal Communities in Temperate America. A Study in Animal Ecology Designed to Serve as 

 a Reference Work and Textbook. By Victor Ehnest Shelford, of the Department of Zoology in the 

 University of Chicago. 



This volume presents the principles of field ecology, illustrated by the more widely distributed animal habitats of the 

 eastern half of temperate North America, and the aquatic habitats of a much larger territory. Six chapters deal wiih general 

 principles. In several chapters the animal communities are considered from the point of view of modern dynamic ecology. 

 A valuable feature of the book is the three hundred figures of widely distributed animals chosen to represent the chief 

 types of animal commimities and their characteristic modes of life. 



380 pages, 8vo, cloth; $3.00, postage extra (weight 44 oz.) 



THE UNIVERSITY OF CHICAGO PRESS 



AGENTS- 



CHICAGO, ILLINOIS 



The Baker & Taylor Company, New York Karl W. Hiersemann, Leipzig 



The Cambridg-e University Press, London, Edinburgh The Maruzen-Kabushlkl-Kaisha, Tokyo, Osaka, Kyolo 



Marine Biological Laboratory 



Woods Hole, Mass. 



Facilities foi research in Zoology, 

 Embryology, Physiology and Bot- 

 any. Seventy-aix private labora- 

 tories, $100 each for not over three 

 months. Thirty tablea are avaU- 

 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 lectures are offered in Inverte- 

 brate Zoology, Embryology, Physi- 

 ology, Morphology and Taxonomy 

 of the Algae, Physiology and 

 Ecology of Marine Strand and Bog 

 Vegetation. Each course requires 

 the full time of the student. Fee. 

 $50 00. A lecture course on th^ 

 Philosophical Aspects of Biology 

 and Allied Sciences ia also offered. 



Animals and plants, preserved, 

 living, and in embryonic stages. 

 Preserved material of all types of 

 animals and of Algae, Fungi. liiver- 

 worts and Moaaes furnished for 

 classwork, or for the museum. 

 Living material furnished in season 

 aa ordert^d. Price lists of Zon- 

 los^ical and Botanical matfrial 

 sent on applicatioD. State which 

 is desired. For price 1 sta and all 

 infiirmation regarding material, 

 address 



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



The annual announcement will be sent on application to 



The Director, Marine Biological Laboratory, Woods Hole 



INVESTIGATION 



Entire Year 



INSTRUCTION 



July 1 to August 11, 

 1914 



SUPPLY 



DEPARTMENT 



Open the Entire Yeeir 



Just 'Published 



PRINCIPLES OF 



STRATIGRAPHY 



BY 



AMADEUS W. GRABAU, S.M..S.D. 



PROFESSOR OF PALAEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



Large Octavo, 1160 pagea, with 254 illustrations la the text. 

 Clotli bound, price, 87.60. 



Bend for deacriptlTe circular 



A. G. SEILER & CO. 



PUBLISHERS 

 1224 Amrteidam Avenue NEW YORK. N. Y. 



