106 



THE DEVELOPMENT OF THE CHICK 





pr.str. 





■ ■■■-■■:■■:: -■■ft:- ' ■ ■■■^ 



Fig. 61. — Embryo of 9 s from above drawn 

 as a transparent object with transmitted 

 light. X 30. 



Abbreviations same as before; in addi- 

 tion: H. B., Hind brain. M. B., Mid brain. 

 n. S., Neural suture. 



