ESSENTIALS ^ 



OF 



ZOOLOGY 



EMPHASIZING PEINCIPLES OF ANI3IAL 



BIOLOGY 



BY 



GEORGE EDWIN POTTER, Ph.D. 



Professor of Zoology, Agricultural and Mechanical College of Texas 



College Station, Texas 



SECOND EDITION 



With 224 Text Illustrations 



ST. LOUIS 

 THE C. V. MOSBY COMPANY 



1948 



