200 



THE MOSAIC STAGE OF DIFFERENTIATION 



i t-l 



B 



Fig. 95 

 Self-differentiation of grafted chick metanephros. A, Metanephric rudiment at 

 the time of grafting (5-day chick). B, Differentiation after 5 days on the chorio- 

 allantois of another egg. (From Danchakoff, Zeitschr.f. Anat. u. Entzogesch. Lxxiv, 

 1924; B, after Atterbury.) 



