Arsenate of lead is prepared as a commercial product by a 

 uumber of companies in the Ü. S. and appears on the market 

 as a sort of putty. 



English Metric. 



Arsenate of lead 3 lbs. or 1.3 kilos. 



Water 50 gis. or 190 liters. 



It may be used at twiee the strength given should occasion 

 arise for so doing but the normal application is usually suf- 

 ficient. 



Considerable complaint has been made regarding the diffi- 

 culty experieneed in dissolving the putty-like mass specially if 

 soineof the water has evaporated from it. In the experience of the 

 anthor, tliis has been most easily accomplished in the following 

 manner :— Place the lead upon a square of burlap and gather 

 up the edges of the cloth, to make a sort of bag. The bag may 

 then be held with one hand and immersed in the water, while the 

 other kneads the mass, thus forcing the lead through the 

 meshes of the cloth. Care mnst be exereised however as some per- 

 sons are Hable to arsenieal poising from external contact, but 

 in the author's experience in the preparation of thousands of 

 gallons of the mixture, no ill effects have ever been felt. The 

 dissolved arsenate of lead remains in susp'ension very well, far 

 better than some of the other arsenicals; nevertheless it is very 

 important that the mixture be agitated frequently during^the 

 process of spraying. 



ARSENATE OF LEAD. HOME MADE ARTICLE.— Wh- 

 ere it is impossible to procure the commercial article, the follow- 

 ing formula may be used. However it is advisable to use the pre- 

 pared product when possible. as there are fewer chances for error 

 in the preparation of the mixtures and less liability of irregula- 

 rity in chemical contení. The formula follows : 



English Metric. 



Acétate of lead 11 óz. or 312 grams. 



Arsenate of soda 4 oz. or 113 grams. 



Water 50 gals. or 190 liters. 



