c 



FIG. 64 A. SECTION OF A LENS OF THE 

 EYE OF A CHICK OF 68 HOURS' INCUBA- 

 TION. A, outer or anterior wall; B, inner 

 or posterior wall. The dark irregular 

 spots show the distribution of the mitotic 

 figures. C, central cavity. 350 diameters. 



FIG. 64 B. SECTION OF A LENS OF THE EYE OF A 

 CHICK OF 96 HOURS' INCUBATION. A, outer wall; 

 , inner wall; C, central cavity. The dark irregular 

 spots show the distribution of the mitotic figures. 

 350 diameters. 



190 



