By Thomas Andrew Knight, Esq. 107 



to have destroyed the insects, but they appeared again in great num- 

 bers, and the frequent use of the engine did not prevent their doing 

 considerable injury. Not improbably an infusion of the green 

 leaves of either the Nicotiana tabacum, or N. rustica, which might 

 have been obtained at a very small expence, would have destroyed 

 or driven them off, but it did not occur to me to try it. 



