Mode of destroying the Black and Green Aphides. 553 



The pot may be made at a trifling expense, and, with care, 

 will last for many years. 



a, the pot ; b, the blow-hole, with a grate at the inner end \ 

 c, the lid, on which is fixed a tube (d) to convey the smoke 

 into the house, through an aperture made in a square of tin 

 (e) which is fixed into the upright sashes (one in every third 

 or fourth sash) instead of a square of glass ; when there are 

 no upright sashes, the tube will require another angle {f). An 

 apparatus of this sort is very convenient, as any person may 

 work it, and fill the houses to any degree required without 

 suffering a night's sickness by it. 



J. Craig. 

 Uowsham, February 15. 1830. 



Art. XII. 



Sir, 



On the Destruction of the Black and Green Aphides 

 on Cherry and Plum Trees. By N. T. 



In my former communication (p. 403.) upon the subject of 

 insects, I observed that the mixture described would not de- 

 stroy the black A'phis on the cherry treej nor the light green 

 A'phis on the plum tree. I have now found that by the 

 addition of another ingredient, viz. one gill only of tobacco 

 water, such as can be procured from any of the tobacconists, 

 both these troublesome insects are readily and effectually de- 

 stroyed, by applying it in the manner before recommended. 

 About three weeks ago I immersed all the young shoots of 

 my cherry trees, plum trees, and black currant trees, which 

 were infested with the A'phides peculiar to each tree, in this 

 mixture, as warm as the hand could bear without inconve- 

 nience, keeping the young shoots and leaves in it a few 

 seconds only. This was done in the evening after the sun 

 was off the tree ; and I found the A'phides all dead the next 

 morning. The leaves of these young shoots are now free from 



