No. 124.] 141 



thus formed in the branch, has a corresponding series of vessels 

 found in the stem from its point of emitting the branch to the root, 

 it is clear that a branch not only increases in substance by the 

 functions of its own organization, but must, of necessity, periodi- 

 cally increase the substance or diameter of the trunk of the tree. 



D, JAY BROWNE. 



