Effect cf Aleohol and Anesthetics on Development. 385 
Fic. 19. A section through the trunk region of an eight day embryo from a 4 
per cent ethersolution. Thespinal cord, ch, isdouble (spina-bifida) and the noto- 
chord, nch, is divided into three parts. 
Fie. 20. A more posterior section of the same embryo, showing the spinal cord 
and notocord again single as they are in regions more anterior than fig. 19. 
THE AMERICAN JOURNAL OF ANATOMY, VOL 10, NO. 3. 
