THE "HYBRID LARCH. 



153 



ments were then plotted so that a representation of a longitudinal 

 section through the tree was obtained (Fig. 2). From this 



Fig. 2. A Vertical Section of the Tree. 

 The thick black line represents the bark. 



picture the increment at any period in the life of the tree can be 

 calculated. Since only the present thickness of the bark is 



