JANUARY.] HOTHOUSE DESTRUCTION OF INSECTS. ] 3 



Extensive practice alone can show the most easy and 

 effectual cure. Fumigating with tobacco is decidedly 

 the most efficacious, and in the power of any to per- 

 form. Take a small circular furnace, made of sheet 

 iron, diameter at top twelve inches, and at bottom 

 eight; depth one foot, having a grating in it to reach 

 within three inches of the bottom, which will leave space 

 for the air to pass, and where the ashes will fall and be 

 kept in safety, having a handle like a pail to carry it 

 with. This, or any thing similar, being ready, put in 

 it a few embers of ignited charcoal; take it into the 

 centre of the house, and put on the coals a quantity of 

 moist tobacco stems. If they attempt to blaze or 

 flame, sprinkle a little water over them ; and as they 

 consume, continue to add tobacco until the house is 

 entirely full of smoke, observing always to do it in still, 

 cloudy weather, or in the evening. If it is windy, the 

 smoke is carried off without having half the effect, 

 and requires more tobacco. The house must be 

 closely shut up. There are several plants whose foli- 

 age is of a soft downy nature, such as Helitrbpiums, 

 Callacdrpas, Sdlvias, and many of the Lantanas, Vincas, 

 with several others, that cannot stand, without danger, 

 strong fumigation. These should be put low down in 

 the house, or under the stage. These fumigations 

 will have to be repeated frequently, the time for which 

 will easily be perceived; and, when required, ought not 

 to be delayed. Several species and varieties of the 

 same genus, Aphis, can be destroyed in the like man- 

 ner. 



Acaris tellurius, or red spider, is caused by a dry at- 



