FORM-FACTOR IN CONIFEROUS TREES. 



145 



The figure, in fact, nearly resembles Fig. 2, and the form-factor 

 is nearly •333, say '320. Thus, in this case, the form-factor 

 decreases rapidly with size from infinity to i-ooo, thereafter 

 decreasing more slowly from i*ooo to about '320. 



This is an example of a form-factor which is not a true 



-expression of form owing to the position of the base and the 

 varying proportion of the volume above to that below the base. 



III. Absolute Form-factor with Timber Measurement 

 TO 3 Inches Diameter. 



Here the base is on the ground, and the form-factor expresses 

 the ratio between the volume of the stem up to 3 inches 

 diameter and that of a cylinder of the same base but of the total 

 height of the tree. 



For the sake of convenience of description, let us call that 



