OUTLINES OF 
ZLOOLOGY 
BY 
ry 
Ke ARTHUR THOMSON, M.A. 
REGIUS PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF ABERDEEN 3 
JOINT-AUTHOR OF ‘‘ THE EVOLUTION OF SEX”; 
‘THE STUDY OF ANIMAL LIFE,” ‘THE SCIENCE OF LIFE,” 
‘‘THE PROGRESS OF SCIENCE,” ‘“‘ HEREDITY,” 
** DARWINISM AND HUMAN LIFE,” ETC. 
AUTHOR OF 
FIFTH EDITION, REVISED, WITH q20 ILLUSTRATIONS 
NEW YORK 
D. APPLETON AND COMPANY 
1916 
107 
