TWENTIETH CENTURY TEXT-BOOKS 
ANIMAL LIFE 
A FIRST BOOK OF ZOOLOGY 
BY 
DAVID STARR JORDAN, Pu.'D., LL. D. 
PRESIDENT OF LELAND STANFORD JUNIOR UNIVERSITY 
AND 
VERNON L. KELLOGG, M. S. 
PROFESSOR IN LELAND STANFORD JUNIOR UNIVERSITY 
NEW YORK 
D. APPLETON AND COMPANY 
er 
