SUCCESS IN MARKET GARDENING 



be operated only an hour, or perhaps a little more, 

 to fumigate the entire building effectively. Such 

 a fumigation having been repeated three nights 

 in succession, is then intermitted till another time 

 arrives when it seems to be needed, or might be 

 prudently employed as a preventive. 



Vapour of sulphur may be obtained by use of a 

 kettle or basin containing sulphur (brimstone) 

 heated nearly to the boiling point, and kept at 

 that heat as long as the process is desired to con- 

 tinue. A small kerosene stove and an iron kettle 

 form a convenient and manageable equipment. 

 Vapour enough should be generated to visibly fill 

 the house or apartment, and give off a noticeable 

 odour. But the sulphur must be carefully watched 

 to prevent its taking fire, in which event fumes 

 would arise destructive to all plant life, and might 

 do extensive mischief. 



Probably the two worst insects we have to com- 

 bat are the red spider and the white fly. They 

 both can be killed by use of cyanide gas. 



An ounce of cyanide used with two ounces of 

 sulphuric acid and four ounces of water to 2,000 

 cubic feet will kill the white fly and not injure 

 some crops. But great care must be used, as the 



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