356 



On the Growth of the Blastoderm of the Chick. 



fi) 



FIG. D. (i) Diagram of unincubated Blastoderm, 

 (ii) Blastoderm after 24 hours' incubation. 



(i) 



X - - 



__1 A O 



-2VX-- AV 



FIG. E. (i) Diagram of unincubated Blastoderm. 



(ii) Blastoderm with five Pairs of Mesoblastic Somites. 



derm, if placed close to the edge of the blastoderm generally hinders 

 the development of that side. But if placed at some distance from 

 the blastoderm, it is eventually passed by the advancing edge of the 

 blastoderm, and is found within the area opaca, though usually a 

 streak is left between it and the edge of the blastoderm. 



