x9io.] Coombe Plantation, Keswick. 



271 



off is well illustrated by some measurements made in the 

 vicinity of an experimental group at an elevation of 1,150 ft, 

 The average height of the trees of the group, which is situated 

 in a hollow, is 62 ft., with a volume of 18 cubic ft. quarter- 

 girth measurement; while on the adjacent ridges 10 yards 























1 



















~* rr 900' 



T?tiH a ••• 



A 









































_ >'5o' C 



















— *^*T ■ 



O'VSRY expo: 



EO) F 





1 























13. 



9 

















500 GROUP 



E 







F ' 

 - 







































*5 30 35 ♦<» +5 5 0 5 5 6 0 



Curve B. — Girth Curve for Larch. 



distant the height falls off to 47 ft., and the volume to 8 cubic 

 ; ft. quarter-girth.* 



While thriving best in breezy situations, the larch cannot 

 stand exposure to heavy winds. This point has already been 

 illustrated by Plates 1, 2, and 3. It will be seen from the 



* Mr. Marshall's girth measurements were made at a height of 4 ft. from the 

 1 ground. The form factors, however, have been calculated, for the sake of comparison 

 with other form factors, with reference to the diameter at breast-height (4 ft. 3 in.), 

 j I he quarter-girth volume has been taken throughout at -75 of the true volume. 



