272 



Coombe Plantation, Keswick. [July, 



elevation-volume curve below that the average volume at- 

 tained by larch at 1,350 ft. is about 7 cubic ft. quarter- 

 girth. Measurements of a group of larch occupying a par- 

 ticularly well-sheltered situation at the same elevation showed 

 that the average volume attained was 13*5 cubic ft. quarter- 

 girth. 



A further reference to the same curve will show that with 

 increasing elevation the average volume of larch per tree 



lOOO' HOO' I20o' I300' l*QO' 1500 



Elevation v 



Curve C. — Elevation-Volume Curve. 



jf'I 



shows a steady decrease until an elevation of 1,250 ft. is 

 reached, when the decrease becomes more rapid. This is 

 due to the conformation of the ground, resulting in an aspect 

 which rapidly becomes more and more exposed. At 1,500 ft. 

 the trees do not average more than 2*5 cubic ft. per tree, and J 

 it is evident that the plantation has not been a success 

 financially at this elevation. This point will be referred to j 

 again. 



An interesting phenomenon has taken place on the steep 



