THE GREEN-HOUSE. 



171 



The aphis or green fly is destroyed with ease and 

 certainty by fumigation with tobacco. For this pur- 

 pose there is a sort of refuse tobacco sold in the shops, 

 and an appropriate bellows, with a receptacle in its 

 nozzle for the tobacco; by which means the smoke is 

 blown out at the end of the nozzle, through a dispenser 

 or rose like that of a watering-pot. The mode com- 

 monly adopted by gardeners, however, and one fully 

 as effectual, and attended with less waste of tobacco 

 and trouble, is as follows : — 



Either grow a few plants of tobacco on purpose 

 for fumigation, or procure a quantity of the cheapest 

 tobacco, which last will be found the strongest and 

 best for the purpose of fumigation. Then taking 

 what may be considered a sufficient quantity to fill 

 the air of the house with smoke, open it out into 

 leaves or fragments, and sprinkle it with water to 

 prevent its burning too quick : next provide a mid- 

 dling-sized flower-pot, in the side of which near the 

 bottom a hole must be pierced with a cold chisel and 

 hammer ; put a few lighted coals into the pot, and 

 strew a little of the moistened tobacco over them ; 

 then by blowing with a pair of common bellows at 

 the hole in the side, smoke sufficient to fill the air of 

 the house may be procured in the space of ten or fif- 

 teen minutes. The calmest weather must be chosen 

 for this work, otherwise there will be a waste of 

 smoke ; and it must be repeated two or more evenings 

 in succession, if the insects are in great vigour. 



The coccus is never very numerous in a green- 



