179 



to account for the myriads of these pests which then 

 occasionally appear, without having recourse to the 

 ignorant suggestion that they are engendered by cer- 

 tain winds, or states of the atmosphere. 



To prevent their appearance, take sulphur vivum, 

 sifted lime, and Scotch snuff, equal quantities of each ; 

 lamp-black, half the quantity ; mix them to the thick- 

 ness of paint, with stale brine and soapsuds. With 

 this mixture paint the wall and trees, and over all the 

 buds, very early in the spring, just as they begin to 

 shew colour. We doubt not that this is a serviceable 

 wash ; and if the lamp-black causes an unsightly ap- 

 pearance, clay or some other substance must be sub- 

 stituted, to dilute and increase the bulk of the mix- 

 ture, which otherwise may be too strong for the trees. 

 {Gard, Chron. 1845, 154.) 



If the aphides do make their appearance in the 

 spring, syringe the trees on which they are with to- 

 bacco-water. Do it two or three times, after intervals 

 of a day or two, and whilst the sun is shining upon 

 the leaves. 



Broivn Scale appears to be the same as preys upon 

 the grape-vine, {Coccus vitis), and like that tree the 

 peach is liable to its attacks both under glass and in 

 the open air. It is, says Mr. Curtis, a longish brown 

 insect, which in old age assumes a blackish brown 

 colour, and becomes hemispherical and wrinkled. 

 The females are shield-like, being convex above and 

 N 2 



