J 



I 



LAIJOIJATOIJV STl'DIES 

 IN ZOOUHJV 



BY 

 ir. D. REED, B.S., Ph.D. 



I'rnfr.ssor of Zoolofjy, Conirll Unircrsily 



AND 



B. P. YOUNG, B.S., Ph.D. 



Assistant Professor of Zoology, Cornell I'niversUi/ 



First Edition 



McGRAW-IIILL BOOK COMPANY, Inc. 

 NEW YORK: 370 SEVENTH AVENUE 



LONDON: 6 & 8 BOUVERIE ST.. K. C. 4 

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