EVIL EFFECTS OF PRUNING. 259 



goes on so rapidly, that long before the wound is 

 healed and covered over with the bark, a cavity is 

 formed of such size that healing is beyond all power, 

 and the only matter left for consideration is how best 

 to prevent the total destruction of the tree, a cir- 

 cumstance which, though elsewhere explained, may be 

 here repeated as the process of filling or anointing 

 the wound with vegetable tar, or oil of tar, sometimes 

 termed creosote, which latter is of all appliances the 

 best. 



