16 MOW TO DESTROY INSECTS. 



fumigation. The flies will be found at the bottom of 

 the tub when the operation is finished. 



" The pHnts should be perfectly dry when the opera- 

 tion is pert.'*i (fled, "but, if a towel is used, it should be 

 freshly washed and wrung out before using, and be 

 without holes. The p^pe-stem should reach to the bot- 

 tom of the tub. 



" Be careful when a number of plants are in flower 

 in a greenhouse or conservatory; tobacco-smoke will 

 spoil the flowers." 



Other Ways of Fumigation. Place the plants under 

 a barrel, together with a dish of burning tobacco-stems 

 and leaves, and the smoking will be effectual, closing 

 the career of aphis, mealy lug, green fly, and brown 

 scale. 



The smoke will be strong enough to suffocate human 

 beings; and the plants even, on being confined in it for 

 an hour, will look pitiful enough, but washing with 

 clean water will enliven them quickly. 



Submerging. Another cultivator prepares a quantity 

 of warm suds in a large, deep vessel, a bathing-tub or 

 something similar, then covers the surface of the soil in 

 the pot with a circular piece of pasteboard fastened on 

 with a stout cloth bandage to prevent dislodgment of 

 the soil by the water, and lays the pot lengthwise 

 therein. Every part of the plant must be completely 

 submerged and remain thus half an hour. Except in 

 the worst cases this effects a cure. 



