106 



THE DEVELOPMENT OF THE CHICK 



. ■:: -:^>;rt\vJa:i:S-;;|■ 



jor.str. 





•^ 



■ •■; ##.; 



.// 



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.j Neural suture. 



