COMPARATIVE ZOOLOGY 
Structural and Systematic 
FOR USE IN SCHOOLS AND COLLEGES 
By JAMES ORTON, A.M., Ph.D. 
H 
LATE PROFESSOR OF NATURAL HISTORY IN VASSAR COLLEGE; CORRESPONDING MEMBER 
OF THE ACADEMY OF NATURAL SCIENCES, PHILADELPHIA, AND OF THE 
LYCEUM OF NATURAL HISTORY, NEW YORK; AUTHOR 
OF “THE ANDES AND THE AMAZON,” ETC. 
REVISED EDITION 
r 
The education of a naturalist now consists chiefly in learning how to 
compare. ’ ’— Ag a ssi z. 
NEW YORK 
HARPER k BROTHERS, FRANKLIN SQUARE 
1 893 
