All That a Microscope 

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The optical and mechanical accuracy of each 

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^auscli |omb 



Microscopes 



For the most delicate and accurate of research 

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 adapted to meet them. 



Model BH-2 (illustrated) costs $31.'^0. Other compound 

 microscopes from $18 to $328.50. Simple microscopes, from 

 $2 to $17. 



Our catalog gives full description and prices 

 Special Terms to Educational Institutions 



Bausch ^ Ipmb Optical (o. 



41 2 ST. PAUL STREET ROCHESTER, N.Y. 

 New York Chicago Washinston San Francisco 



S 



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The Mechanistic 

 Conception of Life 



Biological Essays by 



Jacques Loeb 



Head of the Department of Experimental Biology 

 Rockefeller Institute for Medical Research 



THE achievements of Professor Jacques 

 Loeb in the field of experimental biology 

 have made him so widely known as to 

 insure any book of his a large and interested 

 circle of readers. 



In his latest work, The Mechanistic Concep- 

 tion of Life, Professor Loeb presents many 

 of the current problems in biology on which 

 he has been engaged in recent years. These 

 may be characterized in a general way as 

 an attempt to analyze life from a purely 

 physicochemical standpoint. 



238 pages, izmo, cloth; price $1.50, postage extra 

 (weight 30 oz.) 



The University of Chicago Press 



Chicago .... Illinois 



