11 



2. Ants, — When the nest has been located, bore two or more holes 

 to a depth of 1 to 2 feet in the centre of the nest and pour 2 ounces of 

 bisulphide down each hole. Close the hole with earth immediately. 



Borers in frees. — Where the sawdust nnd castings indicate an 

 active borer at work, inject a little bisulphide with an oil-can into the 

 hole and stop the opening with clay. 



To sterilise soils for seedlings and delicate pot plants — Place the soil 

 in a suitable box or tin with a close fitting lid. Pour on one ounce 

 of bisulphide per bushel of soil, after two diiys, spread t^e soil out in 

 the open air. All insect life in the soil will thus have been destroyed. 

 This treatment is found not to injure in any way the fertility of the 

 soil. 



Stored Products. 



To disinfect a granary. — Where large quantities of grain are 

 stored in a building and serious losses through weevils and other insect 

 pests occur, it is a great advantage to treat the whole building with 

 carbon bisulphide. 



To do this certain obvious precautions are necessary. 



(1) The building must be made fairly tight Ventilators must 

 be papered over and doors made to shut close. 



(2) Preparations must be made so that a number of men can enter 



the granary simultaneously, each to pour out in a prepared re- 

 ceptacle the requisite dose of bisulphide and then immedi- 

 ately to retire The building should then be kept close for 48 

 hours and all windows and doors opened for four hours before 

 it is again occupied. 



(3) Stringent precautions to preclude any chance of firing the in- 



flammable vapour must be taken. 



For every 25 square feet of floor space supply 1 square foot of eva- 

 porating surface (flat tins or dishes). 



Each pan or dish should receive one pound of liquid. The dishes 

 should be placed on level supports four feet from the ground. An entire 

 store of grain could thus be freed of insects at one operation extending 

 from Saturday to Monday. 



To free grain from insects on a smaller scale. — Carbon bisulphide in 

 the proportions here recommended will destroy insects in grain without 

 affecting the germinating power of the seeds. 



Every person who stores corn, peas or other grain subject to insect 

 attacks, should prepare a fumigating box as follows : — 



Obtain a barrel, puncheon or packing case of suitable size. 



Line the inside with building pjper stuck on with a mixture of 

 varnish and whitening (chalk). Construct a lid which can be fastened 

 down firmly on a bearing coated with felt. For every 50 cubic feet of 

 space in the receptacle employ one ounce of bisulphide. For an ordi- 

 nary flour barrel one teaspoon full (-^ ounce) of bisulphide should 

 suffice if the receptacle be tight and free from leaks. 



Place the bisulphide in a saucer on the surface of the grain, and keep 

 tightly closed for 36 hours. 



Clothes Moths. — Great damage to clothes is done in the tropics by 

 Tarious species of clothes moths. Camphor and naphthalene or pyreth- 



