194 



C. M. CHILD AND L. H. HYMAN. 



the various experimental conditions, except in certain cases of 

 strong contraction of the parent body or stalk to be mentioned 

 below. 



In still later stages, after the stalk has developed and the bud 

 is nearly ready for separation, the course of disintegration varies 

 according to conditions. Where the bud remains well extended 



21 



20 



*f3v 



22 



FIGS. 14-24. 



and quiescent the gradient is basipetal as in the earlier stages 

 (Figs. 16-19), but where the stalk undergoes marked contraction 

 in the susceptibility agent the stalk region appears as a region of 

 high susceptibility, disintegration beginning in it as soon or al- 

 most as soon as in the hypostome region. In such cases disinte- 



