AN INTRODUCTION TO 



ZOOLOGY 



BY 



C. H. O'DONOGHUE, D.Sc., F.Z.S. 

 If 



PROFESSOR OF ZOOLOGY, UNIVERSITY OF MANITOBA; FELLOW OK UNIVERSITY 



COLLEGE, LONDON ; ASSOCIATE OF KING'S COLLEGE, LONDON ; FORMERI.Y 



BEIT MEMORIAL FELLOW FOR MEDICAL RESEARCH, 



UNIVERSITY COLLEGE, LONDON 



D. APPLETON AND COMPANY 

 NEW YORK MCMXXI 



