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Camphor. Camphor as a repellent, and to some 

 extent as a fumigant, has a value as an insecticide. Placed 

 in trunks, boxes and wardrobes, it has a tendency to 

 keep out moths, cockroaches and similar insects. It is 

 useful also for keeping the nests of fowls free from 

 parasites. 



As a fumigant, camphor in equal parts with carbolic 

 acid, is excellent for killing mosquitoes in the rooms of 

 dwelling houses. Four ounces of this mixture for each 

 1.000 cubic feet of space in the room, vaporized by being 

 placed over a gentle heat, will kill all the mosquitoes if 

 the room is tightly closed for two hours. This is one of 

 the best fumigants for this purpose ; the fumes are prac- 

 tically harmless, possess excellent disinfecting qualities, 

 and leave in the room a pleasant, refreshing odour. 



Naphthalene. This is sold in the form of flakes and 

 crystals, and in moth balls, and in both forms is well 

 known for its characteristic odour which has the property 

 of repelling insects. Used in the manner suggested for 

 camphor for protecting clothing, books, etc., in boxes and 

 trunks, it is both cheap and effective. A very strong 

 atmosphere containing naphthalene is fatal to many 

 insects. 



The flakes seem to be more effective than the moth 

 balls, no doubt because the former volatilize more 

 rapidly, and partly perhaps because they can be more 

 thoroughly distributed throughout the materials to be 

 protected. 



Some persons object to the odour of naphthalene, but in 

 many cases this is largely due to their not being sufficiently 

 familiar with it, and at the same time their not realizing the 

 very considerable usefulness of this insecticide in the protec- 

 tion it gives from tropical insects. 



Naphthalene is one of the constituent parts of Para- 

 naph, an insecticide originated by the Jamaica Department 

 of Agriculture, which is said to be of value as a contact 

 poison for the destruction of fleas, ticks, plant lice, and cer- 

 tain scale insects. 



Alum. Alum is said to repel or to destroy fleas when 

 dusted on the floor of an infested room, and when used for 

 that purpose, to prevent the occurrence in beds of these 



