30 Destruction of the Aphis lanigera. 



Art. XVI. Description of a Machine for dusting Fruit 

 Trees with powdered Lime or other Powder. By C. P. of 

 York. 



Sir, 



After the instrument described by Mr. Samuel Curtis, in 

 Vol. I. p. 415. of your excellent Magazine, for the ejectment of 

 lime-dust, perhaps you may think it worth while to record 

 another one for the same purpose, which I had constructed 

 several years ago, and which, although I have taken the pains 

 to set forth its advantages to several individuals, I have not 

 yet seen any where in use. This instrument consists of a 

 pair of common bellows, with this difference only, that the 

 lower board and valve are omitted, and a piece of tin, resem- 

 bling in shape those tin scales used in the retail of meal 

 (/&17.a),/m the flat " 



end of which (b) are > jg^^;.^4^^ |g^ 

 two small valves, one W ^ "" " - Agaasi W 35 - ■ 



fourth of an inch dia- ^^-~— __" V • ® »/ 



meter, with a screw- ^ ^ 



hole to introduce the dust. It is evident that the air which 

 enters from the valves by the up-stroke of the bellows raises 

 the dust in the interior, which is ejected by the down-stroke ; 

 and, by repetition, the whole powder introduced, capable of 

 rising from the draught, will be thrown out. 



The transplanter, described by you as of French invention, 

 opening upon hinges, (Vol. I. p. 268. fig. 53.) was the invention 

 of the Rev. Mr. Thornhill, vicar of Staindrop, Durham, up- 

 wards of twenty years ago, and was used extensively in the 

 transplanting of turnips on his farm. I have one at present 

 from him, and I use it not only for the above purpose, but in 

 plunging pots. I remain, dear Sir, yours, truly, 



York, April, 1826. C. P. 



Art. XVII. Account of a successful Attempt to destroy the 

 Aphis lanigera. By Mr. R. Turner. 



Sir, 

 I beg leave to communicate, for the benefit of your readers, 

 that, in the year 1823, I had an apple tree, a seedling pear- 

 main, with several others, attacked by the A^phis lanigera, 

 introduced into my garden by some trees purchased the pre- 



