146 FUMIGATION METHODS 



Last year in my largest Jiouse I only found it necessary 

 to fumigate once, and until the violets were thrown out 

 this spring I never saw another aphis in it. I cannot 

 now give you exact information in regard to the cost 

 of fumigation. 



" I do not entrust the operation to any one, as the 

 risk, which I believe to be great, I take myself. 

 Therefore all the fumigation which I have done I have 

 done alone, except with a friend to assist; but the 

 people who work about the house have nothing to do 

 with it. Fumigating is done about an hour or two 

 after dark. I grow Farquhar, Lady Campbell, and 

 Imperial violets; also a few La France. Last year I 

 had some of them in one house. The leaves of the 

 La France were slightly injured by an exposure of 

 twenty-one minutes. 



"The black aphis were very prevalent; in fact, 

 the plants were completely covered with them when I 

 gave the application of which I have spoken, but it 

 cleaned them out. I have used it also in violet frames 

 and in a mushroom house. In the latter case I used 

 it with great strength. I found mice, snails, roly- 

 polys, and earthworms dead in the morning. This I 

 put in and allowed to stay all night. I have also 

 found from experiments that nothing can breathe the 

 gas and live. 



' ' In my opinion no one can successfully grow 

 violets, at least in this vicinity, who does not use the 

 gas. I have now one house 23^ feet wide by 200 feet 

 long, one 20 feet wide by 100 feet long, one 12 feet 

 wide by 60 feet long, all devoted to the growing of 

 violets. ' ' 



