No. 4.] 



TREE SURGERY. 



463 



Fig. 20 shows a wound the conditions for the healing of 

 which ar(^ still more favorable. It is not a fruit tree, it is 

 younger, being only twenty years old, the wound is higher 

 on the trunk, and smaller, being only 3% by 5 inches. It 

 is now nearly healed, but the wood is cracking, and decay 

 will soon begin. 



Fig. 21 shows a wound slightly smaller than the last, on 

 a chestnut tree about seventeen years old, which has never 

 borne fruit until the present season. This wound, 15 feet 

 from the ground, has healed entirely in six seasons. Here 

 the conditions were all favorable, the chestnut being a tree 



20. — Wound ten feet 

 groimd on tree twenty 

 old, healed considerably 

 years. 



Fig. 21. — Wound fifteen feet 

 from ground on tree seventeen 

 years old, healed entirely in 

 six years. 



of rapid growth ; but, as the surface of the wound was not 

 dressed when the wound was made, decay of the trunk has 

 already begun. 



There is a means of stimulating the growth of trees, the 

 etfects of which should be further and more scientifically 

 investigated, and that is, — 



Scraping Trees. 

 Let us consider a moment the bark growth of a tree. 

 We find that bark on young trees or on small limbs is 

 usually smooth, while on large trunks or very large limbs it 

 is commonly seamed, cracked or scaled. As the wood of 

 the trunk or limb grows larger, its growth must exert a 



