﻿BOTANICAL CA//./ II- 



delicate cell walls confuse the microscopic picture. That the cells 

 whose walls are thus being changed are not degenerating, witness 

 the fact that cell divisions may be taking place, and the condition 

 of the nucleus and cytoplasm. 



layer; its composition 

 Only one tier of cells may be involved in the act of separation 

 (pi. figs. 5, 7), this usually in smaller, younger leaves and inter- 

 nodes, except that in young leaves there is a tendency to increase 

 the number of layers involved. In larger nodes, in which there 



