three hundred figures of widely distributed animals chosen to 
represent the chief types of animal communities and their 
characteristic modes of life. 
Artificial Parthenogenesis and Fertilization. By Jacques Loeb, 
Member of the Rockefeller Institute for Medical Research. 
318 pages, 12mo, cloth; $2.50, postpaid $2.68 
This new work presents the first complete treatment of the 
subject of artificial parthenogenesis in English. Professor Loeb 
published four years ago a book in German under the title Die 
chemische Entwicklungserregung des tierischen Kies. Mr. W. O. 
R. King, of the University of Leeds, England, translated the 
book into English, and the translation has been revised, en- 
larged, 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 spermatozoon 
induces development. Since the problem of fertilization is in- 
timately connected with so many different problems of physi- 
ology and pathology, the bearing of the facts recorded and 
discussed in the book goes beyond the special problem indicated 
by the title. 
The Mechamstic Conception of Life. Biological Essays by Jacques 
Loeb, Member of the Rockefeller Institute for Medical Research. 
238 pages, 12mo, cloth; $1.50, postpaid $1.65 
The achievements of Professor Jacques Loeb in the field of 
experimental biology insure any book of his a wide reading. 
His experimental work at the universities of Chicago and Cali- 
fornia, as well as in his present position, gives this volume an 
especial significance. Professor Loeb here presents many of the 
current problems in biology, and discusses the question whether 
the phenomena of life can be unequivocally explained in physico- 
chemical terms. 
Johns Hopkins Hospital Bulletin. All eager to know more of the origin of 
life will find no modern book of its size nearly so instructive or inspiring. 
A Manual for Writers. By John M. Manly, Head of the Depart- 
ment of English in the University of Chicago, and John A. 
Powell, of the University of Chicago Press. 
226 pages, 12mo, cloth; $1.25, postpaid $1.35 
A book designed to aid authors and all others who are 
concerned with the writing of English. It aims to answer the 
practical questions that constantly arise in the preparation of 
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