ANIMAL BIOLOGY 



AN ELEMENTARY TEXT-BOOK 



BY 



C. LLOYD MORGAN 



PROFESSOR OF ANIMAL BIOLOGY AND GEOLOGY IN UNIVERSITY COLLEGE 



BRISTOL, AND LECTURER ON COMPARATIVE ANATOMY IN THE 



BRISTOL MEDICAL SCHOOL 



WITH ILLUSTRATIONS 



RIVINGTONS 

 WATERLOO PLACE, LONDON 



MDCCCLXXXIX 



{Second Edition. Revised] 



