72 



DEVELOPMENT OF FOKM 



[CH. 



with is the relation of the direction of the branches in the 

 crown itself, and the changes in shape of the latter in 

 different trees and at different ages. 



Let us now examine a slightly different case. A young 

 tree, or sapling, of the Mountain Ash, a Willow, or a 



Fig. 20. Third stage in development of the Lime- Willow type. 



Lime, differs from the Oak, Apple, Plane, &c. in that the 

 lateral branches come off at a more or less acute angle 

 with the axis, which again at this stage runs through to 

 the top of the crown, the general shape of which is more 

 or less that of a pointed pyramid, or a more or less 



