PRACTICAL ZOOLOGY 



AN ELEMENTARY TEXT-BOOK TREATING OF 



THE STRUCTURE, LIFE HISTORY, AND 



RELATIONS OF ANIMALS 



BY 



ALVIN pAVISON, A.M., PH.D. 



Professor of Biology in Lafayette College; Fellow of the American 



Association for the Advancement of Science; 



Author of Mammalian Anatomy, etc. 



NEW YORK .-. CINCINNATI .-. CHICAGO 

 AMERICAN BOOK COMPANY 



