MANAGEMENT OF FRUIT TREES, kc. 259 



Frequent watering of wall- trees, ftandards, &c. with lime- 

 water (the making and ufing of which is defcribed in the 

 directions for destroying the aphis), and throwing it plenti- 

 fully on the under fide of the leaves, where the acarus is 

 generally found, will in a fhort time extirpate that deftruclive 

 infect. 



For plants, &c. in hot-houfes, I would recommend ufing 

 water only, and in the following manner : 



Between three and four o'clock in the afternoon, fill the 

 barrow engine with foft water, or fuch as has been expofed to 

 the fun all day, and wheel it along the footpaths of the houfe, 

 where they are wide enough to admit it, and fprinkle all the 

 plants, preffing your finger on the top of the pipe to fpread 

 the water like a fine fhower of rain, playing alio againft the 

 top lights and Shelves till the water Hands an inch deep in 

 the paths of the houfe *. If you cannot conveniently get the 

 engine into the houfe, open the front lights, or, when there 

 are no front lights, Hide down the top lights, and throw the 

 water in it at the front or top. When you begin this opera- 

 tion, if in the in fide, every light muft be fhut ; and if you 

 throw the water in at the front, you muft keep only one 

 light open, which fhut immediately when you have fufficiently 

 watered that part of the houfe oppofite to it ; and, then 

 opening another light, proceed as before ; and lb on, till the 

 whole is properly watered. The houfe muft then be kept 

 clofe fhut till next morning ; this will caufe fuch an exhala- 

 tion from the glafs, tan, (if there are any tan-beds in the 

 houfe,) &c. that the plants will be covered all over with the 

 vapour ; which will infallibly deftroy the cocci, aphides, and 



* I have lately feen a fraall copper engine, made by Mr. Philips, Engine-Maker, Black- 

 friars Road, which anfwers very well, when a barrow engine cannot be got into the houfe. 



Ll 2 other 



