96 BUDS AND STIPULES 



gum which does not completely harden, but remains in 

 a semi-fluid condition ; and as the leaves previously 

 covered up grow and expand, the gum remains attached 

 to their edges, and stretches as a thin film between 

 them. Thus the next youngest leaves are for a certain 

 time enclosed in a small four-sided chamber, two oppo- 

 side sides of which are formed by two leaves, and the 

 other two opposite sides by a thin film of gum. The 

 gum is eventually ruptured and the same process is 

 repeated. 



Glands are present in the axils of the leaves in the 

 great majority of Crucifers (Norman says in nine-tenths), 

 in most Lythrariece, and in many others. 



The connection of these glands with the protection 

 of the young and highly delicate leaf is further shown 

 by their very early development. In fact, in some spe- 

 cies there is a stage in which the glands are actually 

 larger than the rudiment of the leaf itself. They are, 

 however, often very transitory. 



