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APPENDIX A. USEFUL INFORMATION. 



17. Arseniate of Copper. 



2* Ibs. Copper sulphate l 



4 gallons Wate . j Dissolve. Stock solution A. 



1 lb. White arsenic -\ _ 



.,.,__,., / Boil till dissolved : make up to 4 



5 Ibs. Washing soda > * 



.. ^ , 6 \ gallons. Stock solution B. 



2 gallons Water J 



Mix equal parts of A and B, and dilute with 35 parts of water. 

 This is equivalent to lead arseniate standard solution. 



18. Kerosene and Lime. 



(by volume) } pi ne roa( j flust or any fi ne neutral 

 (by volume) > powder will do. 



20 parts Lime 

 1 part Kerosene . 



The same mixture can be made with sanitary fluid, cheap phenyle, or other carbolic 

 fluids. 



STRENGTHS OF INSECTICIDES. 



The following table gives the weights or volumes of insecticides to be used, 

 calculated for the kerosene tin or spraying machine holding four gallons : 



Arsenf. The fatal dose for an adult is from one to two grains, equivalent to 

 three to five grains of lead argeniate, obtainable by drinking from half to a third of a 



