SCIENCE— ADVERTISEMENTS 



McGRAW-HILL 



Agricultaral and Biological Publications 



DR. CHARLES V. PIPER, Consulting Editor 



The success of McGraw-Hill Books on Agricultural Engineering tempted us into the 

 broader field of Scientific Agriculture and Biology. 



The result is this new series which aims to meet the present-day need of more ad- 

 vanced and scientific agricultural and biological texts. 



PRINCIPLES OF ANIMAL BIOLOGY 



By A. FRANKLIN SHULL 



Associate Professor of Zoology , University of Michigan 



With the Collaboration of 



GEORGE R. LA RUE and ALEXANDER G. RUTHVEN 



University of Michigan 



441 pages, 6x9, 245 illustrations, $3.50 



This book presents a general course in animal biology covering physiology, ecology, taxo- 

 nomy, geographical distribution, paleontology and evolution, as well as morphology. It 

 embodies the material and methods that have been developed in the course in Animal 

 Biology at the University of Michigan. 



LABORATORY DIRECTIONS IN PRINCIPLES OF ANIMAL BIOLOGY 



81 pages, 6x9. $1.00 



GENETICS IN RELATION TO AGRICULTURE 



By E. B. BABCOCK 



Professor of Genetics, University of California 



and R. E. CLAUSEN 



Assistant Professor of Genetics, University of California 



650 pages, 6x9, 239 illustrations, 4 colored plates, $4.00 



A compact, authoritative textbook on the principles of genetics and their practical appli- 

 cations. Professor Conklin, of Princeton, says, "It is in all respects, I think, the best text- 

 book on this subject in the English language." 



GENETICS LABORATORY MANUAL 



56 pages, 6x9, 14 illustrations, $1.00 



Send for copies of these books on approval 



McGRAW-HILL BOOK CO., Inc. 



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