The Development of the Chick 109 



evident that a way is open for the allantois to extend 

 from its present position into the space between the two 

 limbs of the amniotic fold of. 



! H 



FIG. 37. 



", also a longitudinal section, represents a stage still 

 farther advanced. Both splanchnic and somatic stalks 

 are much narrowed, especially the former, the cavity of 



