ANIMAL LIFE 369 



For use in spraying mix eight ounces of Paris green with 

 a little water and mix it into a paste, then add it to fifty 

 gallons of water. If two pounds of lime are added to this 

 mixture, it will serve to neutralize any free arsenious acid. 



Lead arsenate has been used for a number of years as 

 an insecticide. It is the most insoluble of the insecticides 

 now in use. It adheres well to the leaves and is not in 

 the least liable to scorch them as is Paris green and London 

 purple when not used with lime. 



For spraying purposes two pounds of the commercial 

 paste in fifty gallons of water will give good results. 



Contact Poisons. Lime-sulphur is a common contact 

 poison. It is prepared by heating together eight pounds 

 of sulphur, four pounds of good quicklime, and five gal- 

 lons of water. The lime should first be slaked, after 

 which the sulphur mixed with water is added. The 

 whole mixture is then boiled for an hour. More water 

 should be added as the boiling continues, to replace that 

 lost by evaporation. After the boiling is completed the 

 clear liquid should be poured off and placed in closed 

 kegs or barrels, since it oxidizes on coming into contact 

 with the air. 



For use in winter to exterminate scale insects the liquid 

 should be diluted until it tests 5.0 on a Baume* hydrom- 

 eter. For use as a summer spray it should be diluted 

 to test 1.0 Baume*. 



Since kerosene will not mix with water, an emulsion is 

 made by dissolving one pound of soap in two gallons of 

 water and adding two gallons of kerosene to the solution. 

 These should be thoroughly mixed by pumping the mix- 

 ture through a bucket sprayer. 



When applied to the surface of pools of stagnant water, 

 kerosene kills the mosquito pupa by suffocation. 



