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out a conftant attention to thefe noxious 

 infedls, a whole field of plants may be foon 

 deftroyed ; and even if any of them are left 

 in the leaves, during the cure, they prove 

 equally deflrudlive. This is termed " worm- 

 ing the tobacco;" and as thefe worms are 

 found moft predominant the latter end of 

 July, and the beginning of Auguft, they 

 muft be particularly attended to at that 

 feafon. 



As I have jufh obferved, that it is impof- 

 fible, without experience, to point put the 

 due time for topping the plant, fo it is 

 equally as impoffible to afcertain the time 

 it will take to ripen in this climate. That 

 can only be known by future obfervations ; 

 for as it is at prefent only cultivated in 

 England as an ornament for the garden, no 

 attention has, I believe, been hitherto be- 

 ftowed on the prefer vation of its leaves. 

 The apparent figns, however, of its matu- 

 rity are thefe : The leaves, as they approach 

 a ftate of ripenefs, become more corrugated 



or 



