THE DEVELOPMENT OF THE CHICK 
op. Ves. 
: \ 
ceph. Mes. 
£6. 
PESETS. 
Fig. 61. — Embryo of 9 s from above drawn 
as a transparent object with transmitted 
hight. x 30. 
Abbreviations same as before: in addi- 
tion: H. B., Hind brain. M. B., Mid brain. 
n. 8., Neural suture. 
