By Thomas Andrew Knight, Esq. 29 



apparently remain. The dislike of this very troublesome insect to 

 sulphur is well known, and I do not entertain any doubt that, 

 relatively to those, the application of it operated very beneficially ; 

 but I am wholly unable to conjecture by what mode of operation it 

 could have acted beneficially in preserving the foliage of my trees ; 

 and whether it did or did not cause their preservation, can only be 

 determined by future experiment. 



