90 



THE HEALING OF WOUNDS 



saving the tree. That is, dressings are preven- 

 tive, not curative ; and in this they are akin to 

 the antiseptic dressings of the surgeon, which 



A sound knot. 



prevent contamination of the wound and thereby 

 allow nature to heal it. 



In order to present another view of wood decay 

 as a result of pruning, I have asked my col- 

 league, B. M. Duggar, to prepare a few para- 

 graphs on the subject, and these now follow: 



" The exposed surface left by the pruning saw 



