115 



4.' 





V. 



Vsi 





'^r^. 





X, 





.k:^^ 



^"^t 



.J 



f, -> \j-' 



--'/--X^, ^ 



*^:'\ 



^ V ^ 





/" N 





^v /'- -..^j^ 



Fig. 13. 



Typical cell arrangement in epithelial cultures. X 700. 



From The Journ. of Exp. Med. 1922, XXXV. 367. 



8* 



