238 
bellows in the house, that the smoke may alight 
upon the floor, being always careful to avoid play- 
ing it directly upon any of the plants, as they 
would be injured by it. 
The house must be so completely filled, that 
the whole of the plants may be hid from the oper- 
ator. If this were not done, it is more than pro- 
bable that some might escape death, and by their 
vast increase would again soon numerously popu- 
late the plant. It would be better to fill the house 
again the succeeding evening. If English-grown 
tobacco is used, instead of damping it with water, 
it would be of great advantage to use strong to- 
bacco water, as the English tobacco is not so 
strong as that manufactured. 
A very proper period for the destruction of 
those insects which annoy the Green-house plants, 
will be in autumn, at the time when they are 
removed from the summer Green-houses, or other 
apartments for their winter destination j or, if 
necessary, any time through the winter months will 
do, taking care to have them clear of the vermin 
before the early part of spring. If only a few 
plants are infested, rather than fumigate the house, 
it would be better to remove them into a small 
room, where the smoke could be well confined, 
and fill it as above ; or each plant, together with 
the pot, might be immersed, in a vessel supplied 
with the Mixture (No. 1.) There should be much 
care in removing the plants, that the insect may 
not be shaken off and left in the house. It may 
