ORIGINATION OF XEROPHYTISM 249 



The conclusions reached in this and in previous papers are to 

 the effect that succulence results from the conversion of poly- 

 saccharids into pentosans or mucilages, and xerophytism from 

 a conversion of the polysaccharids into the anhydrides or wall 

 material, both transformations being induced by a depleted or 

 lessened water supply in the cells. 



