28 On the Diseases of the leaves of the Peach-Tree, 



in the open air, amongst other trees of the same species. A few of 

 the species of scale insect, which is the usual pest of the Peach 

 house, were then transferred to the Peach trees upon my open wall, 

 on which they encreased considerably during the succeeding summer 

 and autumn, and extended themselves over nearly a whole tree on 

 one side, and on nearly half a tree on the other side. In the follow- 

 ing winter my gardener applied to the trees to which these insects 

 had extended themselves, a mixture of lime and flowers of sulphur, 

 dressing the whole of one tree, and about one half of the other. 

 In the following spring, whether owing to the application above- 

 mentioned, or, as is, I think more probable, the effects of winter, 

 the insects wholly disappeared : and the following very singular 

 circumstances occurred. The leaves of all the Peach trees growing in 

 the situation above-mentioned were almost wholly destroyed in the 

 spring of 1833, exclusive of those of the trees to which the mixture 

 of lime and flowers of sulphur had been applied ; whilst all the 

 foliage of one tree, and that of one half of the other presented a 

 perfectly healthy character, as far, precisely, as the dressing above 

 described had extended. In the spring of the present year, when the 

 blossom buds of my Peach trees had acquired about the size of 

 hemp seeds, water holding in solution or suspension, a mixture of 

 lime and flowers of sulphur and soot, was thrown upon all the Peach 

 trees abovementioned, with an engine, in sufficient quantities to wet 

 the whole of the trees and wall, but not materially to affect the 

 colour of the wall. No injurious effects followed, and not a single 

 blistered leaf has appeared upon my trees, which are bearing an 

 abundant crop of fruit, and present an appearance of health, which 

 I have certainly never once before witnessed within the last thirty 

 years. 



The red spider had greatly abounded upon my Peach trees in 

 the preceeding year, and had given my Gardener a good deal of 

 trouble ; but in the present season very few appeared and none 



