ON CANKER. 341 



to recover a little, let it then be immediately 

 pruned clean away, and close up to a good 

 lateral shoot. For when a branch is affected 

 by blight, the part first injured becomes in 

 a short time shriveled, and the disease has 

 always a tendency to spread, which may be 

 perceived by a careful examination of that 

 part of a branch immediately below that 

 which has been first attacked, and by a re- 

 moval of the outer (apparently healthy and 

 sound) bark that the inner bark has become 

 brown, and in some cases nearly black, whilst 

 the diseased sap gives out a strong effusive 

 smell. This appearance will be found to 

 spread down the branch, to a greater or less 

 extent till it dies away in a point, and any 

 lateral branch which may happen to be 

 within reach of this decay, will be destroyed. 



On Canker. 



This is brought upon trees by various 

 means, from injudicious pruning, from bruises 

 &c. in nailing, or from a bad sub-soil, and 

 in some cases it is an inherent disease. If 

 the directions for preparing borders, choos- 

 ing trees, pruning and anointing them, &c. 

 that are laid down in this work, be strictly at- 

 tended to, the trees will seldom be affected 

 with canker. 



When any canker is observed, the part 



