174 



When used for the control of ticks on animals, sul- 

 phur is best combined with oils as is suggested on p. 131 

 Sulphur and lard well mixed and used on setting hens 

 will prove effective in preventing the attacks of mites and 

 lice. Sulphur and air-slaked lime, in equal parts, dusted 

 on the leaves of plants controls plant -feeding mites, red 

 spider and thrips. 



Sulphur dioxide, made by burning sulphur, is useful for 

 fumigating buildings, holds of ships and similar places, 

 for the destruction of mosquitoes and of insects in grain 

 ami seed ; but the tarnishing effect of the gas on metals 

 requires that care be exercised in using this substance in 

 houses. Seeds for planting should not be fumigated with 

 sulphur dioxide, as their germinating power is injured, and 

 often in face completely destroyed, by this process. 



Carbon Bisulphide. This is one of the most useful 

 insecticides for fumigating purposes, as it possesses a very 

 wide range of application, and is very effective in the des- 

 truction of insects. 



Carbon bisulphide is a liquid slightly heavier than 

 water, which volatilizes rapidly at ordinary temperatures. 

 Its fumes are much heavier than air, and have a very 

 considerable power of penetration. They are inflammable 

 and slightly poisonous to man, so that care must be 

 exercised when this insecticide is being used. 



Carbon bisulphide can only be used successfully when 

 the fumes can be confined in a receptacle which is practi- 

 cally air-tight. It is especially valuable for the destruc- 

 tion of insects attacking stored products of all kinds, 

 such as grain, flour, household stores and drugs, books, 

 music, papers, clothing and all similar materials. Gran- 

 aries, store-rooms and dwelling houses may also be fumi- 

 gated for the destruction of insects, while it is effective 

 for dealing with ants and grubs in the soil. 



Grain, seeds, flour, books and clothing can be treated 

 in tight boxes, casks or hogsheads. The amount to be 

 used is calculated in large enclosures at the rate of 1 ft>. per 

 1000 cubic feet of space ; for grain in bins, 1 lb. per ICO 

 bushels. For dealing with smaller capacities the amount 

 to be used is 1 drachm, or roughly a teaspoonful, to each 

 cubic foot of enclosed space. This can be easily calculated 



