258 The Control of Mosquitoes 



to the house or other structure in which it may be 

 used. 



The fumigating pan will use 8 ounces of campho- 

 phenique when made in the dimensions given, namely, 

 6}i inches in diameter exclusive of the overhanging 

 edge, and i}4 inches in depth in the center. With 

 the alcohol lamp one-third full, ample time is given 

 for complete evaporation of the liquid, with about five 

 minutes to spare to allow for conditions which slow 

 down the rate of evaporation. In a fairly tight house, 

 with corrugated metal roof, tightly papered, campho- 

 phenique has given practically perfect restdts. Fotu- 

 ounces of the camphor-carbolic acid mixture and sul- 

 phur in amounts varying from one to three pounds per 

 1000 cubic feet have been used for comparative tests. 

 In several instances considerable leakage, due to the 

 wind passing over the metal roof carrying off ftunes, 

 has occurred, but even when small leaks of known 

 size have been made purposely no change in the results 

 have occurred. We feel justified in saying that cam- 

 pho-phenique in moderately well-built tight houses 

 will give as good results as sulphur, and considering the 

 extra time needed for sulphur fumigation, at an equal, 

 or more probably, a lesser cost. 



In order to test the action of pyrethrum, sulphur, 

 and campho-phenique upon fruit, a series of two ex- 

 periments have been made under the same conditions. 

 Bananas, quite ripe, mangoes, and oranges have been 

 used in these experiments. The mosquitoes were not 

 only placed in the customary positions in houses, but 

 were also carefully hidden as much as possible in 

 bunches of bananas to simulate conditions which would 

 occur on ship board. The results showed that cam- 

 pho-phenique is less harmful than sulphur or pyre- 



