35 



With regard to wall trees, they cannot 

 so well be beat, but they can be easily 

 swept. It is not my object to take notice 

 of different kinds of walls, but I believe the 

 best will have crevices, where the vermin 

 deposit ^%feeir ava ; it will therefore be 

 necessary to sweep the wall carefully and 

 completely before the blossom opens ; which 

 will in a great measure prevent their depre- 

 dations. If, notwithstanding, they attack 

 the blossom, it likewise must be swept off. 

 The use of sweeping, so far as relates to the 

 vermin, will in a great measure be super- 

 seded by the practice of peeling. 







The next cause is constriction of the 



bark. This appears to be a more frequent 

 disease, and more dangerous than is com- 

 monly imagined. It is indicated by the un- 

 equal growth of the tree, in all parts, and 



