AN INTRODUCTION TO 



CYTOLOGY 



BY ^ 



LESTER W. SHARP ^°l^c 



CORNELL UNIVERSITY 





//7 





"The most important discoveries of the laws, rneth<><l~ 

 and progress of nature have nearly always sprung from 

 the examination of the smallest objects which she 

 contains, and from apparently the most insigmficanl 

 enquiries." — Lamarck, Philoaophie Zoologiqut . 



First Edition 



McGRAW-HILL BOOK COMPANY, Inc. 



NEW YORK: 370 SEVENTH AVENUE 



LONDON: 6 & 8 BOUVERIE ST., E. C. 4 



1921 



