





<^:fe-«^ 







'-"-v' 



•4^ 





t» 



1 



»■ -• 



'•;t- 



1 













.'•* 







t--;v- •■-'■•'' i"-i 





mm 



Figure 6. Aggregation patterns of neural-retina cells from chick embryos at 

 7, 9, 11, 14, 17, and 19 days of incubation. (In order, a to f.) Equal cell con- 

 centrations, standard medium, 70 r.p.m., 24 hours. 



