THE BEGINNINGS OF LIFE. 



14$ 



r 



gani 



diff, 



sm 



as 



^rence 



' into 

 ■chha 



5 

 Of 



^ebec 



1 



h 



enquirie 



s 



■ '■^searches o( 

 ired to 



animals % 



called ' cells.' 

 •eing prodiicti 

 lis. Speakiffi 

 lowing adfflit 



3f cells; 

 tance present, 



or le 

 thin itself," 

 its chetniG 

 a capaci' 



I 



more 



) 



en 



r 



this 



med first; 



.ation 



tinues 



to?" 



( 



the 



i0 



-anisi^' 



111 



# 



f 



the 





manner, as the design of the whole requires. This is the 

 fundamental phenomenon of all animal and vegetable 

 vegetation. It h alike equally consistent 'with those instances 

 in ivhich young cells are formed ^within parent cells ^ as 'with 



J3l 



Fig. 4. 



Animal Cells.' 



A. Flattened Epithelium cells from the inside of the mouth. ( x 260.) 



B. Ciliated Epithelium from the human Trachea; magnified 350 diame- 



ters, a. Innermost part of the elastic longitudinal fibres. 6. Ho- 

 mogeneous innermost layer of the mucous membrane, c Deepest 

 round cells, d. Middle elongated cells, e: Much larger super- 

 ficial cells, bearing cilia, and containing nucleolated nuclei. (Kol- 



liker.) 



formation goes on outside of 



The 



generation of the cells takes place in a fluid or in a 

 structureless substance in both cases ^. We will name 



^ There are most important differences between these two modes of 

 cell-formation dependent upon the nature of the material in the midst 

 of which the new units arise. This will be pointed out further on. 



VOL. I. 



L 



« A 



