SCIENCE-ADVERTISEMENTS 



EW BOOKS 



Animal Communities in Temperate America. By Victor E. Shelford, Instructor in Zoology in 

 the University of Chicago. 



This volume by Dr. Shelford 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 with general principles. 



In several chapters the animal communities of lakes, streams, swamps, forests, prairies, and 

 various soOs and topographic situations are considered from the point of view of modem d3rnamio 

 ecology. A very valuable feature of the book is the three hundred figures of widely distributed 

 animals chosen to represent the chief types of animal communities and their characteristic modes 

 of life. 380g)ages,^8vo.,'cloth; S3.22 postpaid. 



Artificial Parthenogenesis and Fertilization. By Jacques Loeb, Member of the Rockefeller Insti- 

 tute for Medical Research. 



This new work presents the first complete treatment of Jthe subject'of artificial parthenogenesis 

 in English. Professor Loeb published four years ago a book in German under the title Die chem- 

 ische Entwicklungserregung des tierischen Eies. Mr. W. O. R. King, of the University of Leeds, 

 England, translated the book into English, and the translation has been revised, enlarged, and 

 brought up to date by Professor Loeb. It gives, as the author says in the preface, 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 sper- 

 matozoon induces development. Since the problem of fertilization is intimately connected with so 

 many different problems of physiology and pathology, the bearing of the facts recorded and dis- 

 cussed in the book goes beyond the special problem indicated by the title. 

 318 pages, 12mo, cloth; S2.68 postpaid. 



THE UNIVERSin OF CHICAGO PRESS TIS^oS' 



AGENTS: The Baker & Taylor Company, New York. 



The Cambridge University Press, London and^Edinbnrgh. 

 Karl W. Hiersemann, Leipzig. i» -f 



The Maruzen-Eabnshiki-Eaisha, Tokyo, Osaka, and Kyoto. 



Just 'Published 



PRINCIPLES OF 



BY 



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



PROFESSOR OF PALAEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



Large Octavo, 1150 pages, with 264 iillustrations in the text. 

 Cloth bound, price, $7.50. 



Send for descriptire circular 



A. G. SEILER & CO. 



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 1224 Anulerdam Avenue NEW YORK. N. Y. 



Archives of Psychology 



No. 23. ReactionSTime and Retinal Stimulation. A. T.[Pof- 

 fenburger, Jr. 73 pages, 70 cents; cloth, 95 cents. 



A study of variations in the reaction time according to 

 the part of the retina stimulated. 



No. 24. Interference [and Adaptability. Arthur Jerome 

 Culler, 80 pages, 75 cents ;Jcloth, $1.00. 



An extension of the work of Bergetrom and others on 

 interference, with attention also to indiTidual differences 

 in this matter. 



No. 25. Reaction to Multiple Stimuli John',WelhoffiTodd, 

 65 pages. 'J- 60 cents ; cloth,E85 cents. 



The'changes in reaction time brought abou by simul- 

 taneous or successive presentation of two or three different 

 stimuli. 



No. 26. Study injlncidental Memory. Garry C. Myers. 108 

 pages. $1.00 ; cloth, 81.25. 



It shows rather remarkable deficiencies in memory for 

 facts which have not been made the specific object of 

 attention. 



No. 27. A Statistical Study of Eminent Woman. Cora Sutton 

 Castle. 90 pages. 80 cents ; cloth, $1.05. 

 A work parallel to Prof. Cattell's studies of eminent men. 



No. 28. The Mental Capacity of the American Negro. Marion 

 J. Mayo. 70 pages. 60 cents ; cloth, 85 cents. 



A comparison of the mental achievements of negroes 

 and white pupils in school work, especially in the high 

 schools of New York City. 



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