34 On an Insect injurious to Fruit-trees. 



injurious to the horticulturist, is to employ children in the 

 summer months to destroy the moths themselves, giving a 

 small premium for every ten or twenty they collect ; and 

 increasing it as the number becomes lessened. When taught 

 where to look for them, they would discover numbers on 

 the bark of the trees ; and if provided with gauze clasp-nets, 

 would find it a most healthy and interesting occupation to 

 catch them when made to fly, by shaking the trees and 

 bushes in which they repose. The destruction of every fe- 

 male moth, before the deposition of its eggs, may be fairly 

 calculated to prevent the existence of some hundreds of 

 larvae ; and thus in any garden not in the neighbourhood of 

 others where the same methods are neglected, the whole race 

 might in a few years be extirpated. 



I have the honour to be, 

 My dear Sir, 



Your obliged Servant, 



William Spence. 



Drypoo), near Hull, 

 May 4, 1812. 



