AN ELEMENTARY 



TEXT-BOOK OF BIOLOGY: 



COMPRISING 



VEGETABLE AND ANIMAL MORPHOLOGY 

 AND PHYSIOLOGY. 



BY 



J. R. AINSWORTH DAVIS, B.A., 



TRINITY COLLEGE, CAMBRIDGE ; 

 *mOPES80R OF BIOLOGY AND GEOLOGY IN THE UNIVERSITY COLLEGE OF WALKS, ABERY8TWYTH. 



HQlitb numerous $llugtrattons an? <Mossav\\ 

 SECOND EDITION, REVISED AND ENLARGED. 



PART II ANIMAL MORPHOLOGY AND PHYSIOLOGY, 



CHARLES GrRIFFIN tfe V/V^J-TAJ. -n-xi j-j O-IJ.J.U.JL JL *m~r } 



EXETER STREET, STRAND. 

 1893. 



[All Rights Reserved.} 



