On Two Species of Insects, §c. 



105 



more abundant. It greatly prefers some varieties of Pears to 

 others ; the Chaumontelle appears, amongst the varieties in my 

 garden, its favorite, and the Glout Morceau that which it likes 

 least. The Moth is, I believe, but little known, for Mr. Curtis, 

 who was so kind as to give me the name of it, did not possess a spe- 

 cimen till he received one from me. My Pear 'Frees had sustained 

 during many successive years so much injury from the depredation 

 of this insect, and their fruit had in consequence become so de- 

 fective in freshness and flavour, that I resolved to uproot the whole 

 of them, if I failed to succeed in destroying or driving away the 

 insects : but in the last summer I had the good fortune to obtain 

 perfect success in driving them away by the means which I pro- 

 ceed to describe. 



Early in the spring of the year, when the blossom buds of my 

 Pear Trees were about the size of large peas, water, which held 

 in suspension a mixture of lime and flower of sulphur and soot, in 

 about equal portions, was thrown by an engine over the Pear Trees 

 and the surface of the wall to which they were trained. I applied 

 this mixture because I had observed, as I have stated in a former 

 communication, that it had apparently prevented the appearance of 

 blistered leaves upon my Peach and Nectarine Trees, though by 

 what mode of operation I was then, as I still am, wholly at a loss 

 to conjecture : but since the first application of it, I have not seen 

 a single blistered leaf upon any tree to which it was applied. I, 

 of course, distinguish blistered leaves from such as have been 

 made to contract by the bite of the aphis. 



The Moths appeared as abundant as in the preceding year ; and 

 I then caused my trees to be washed once in every week during a 

 month, after I witnessed the first appearance of the Moth, with a 

 weak infusion of tobacco in water : this mode of treatment proved 

 successful, and the foliage of my Pear Trees, and some Plum Trees 

 contiguous, escaped all injury. The Moths were, however, only 



VOL. II. 2nd series. P 



