' A TEXT-BOOK 



OF THE 



PRINCIPLES OF ANIMAL 

 HISTOLOGY 



BY 

 V 



ULRIC DAHLGREN, M.S. 



ASSISTANT PROFESSOR OF BIOLOGY IN PRINCETON UNIVERSITY 

 AND 



WILLIAM A. KEENER, A.B. 



ADJUNCT PROFESSOR OF BIOLOGY IN THE UNIVERSITY 

 OF VIRGINIA 



Nefo gotfe 



THE MACMILLAN COMPANY 

 1908 



All rights reserved 



