l6 MAINE) AGRICUIvTURAI, EXPERIMENT STATION. I913. 



4.25 per cent of water soluble arsenic and hence would have 

 been a dangerous Paris green to have used on foliage. These 

 goods were shipped out of the State, and no case was made 

 against the man handling them. 



Pfeiffer's Strictly Pure Paris Green, manufactured by I. 

 Pfeififer of New York, was found to be full weight as the pound 

 package carried 16.3 per cent ounces. It was up in total arsenic 

 but it carried 4.65 per cent of water soluble arsenic which is 

 equivalent to 6.15 per cent of soluble arsenious oxide, or nearly 

 double the amount permitted under the law. Because of its high 

 content of water soluble arsenic it is an unsafe green to use on 

 fruit trees or potatoes by itself, but applied with bordeaux mix- 

 ture or slacked lime it would not burn foliage. 



C. T. Reynold's Strictly Pure Paris Green, manufactured by 

 F. W. Devoe & C. T. Reynolds, of New York, was full weight 

 goods, a half pound package carrying 8.1 ounces. They, how- 

 ever, carried 3.24 per cent of arsenic in the water soluble form, 

 equivalent to 4.27 per cent of soluble arsenious oxide. No 

 prosecution was brought for these goods in Maine, but under 

 Insecticide xA.ct Judgment No. 3, issued by the United States 

 Department of Agriculture, this company was fined for selling 

 Paris green adulterated because it contained an excessive 

 amount of water soluble arsenic. 



The S'herwin-Williams Strictly Pure Paris Green carried 2.49 

 per cent of arsenic in the water soluble form and was, therefore, 

 within the maximum permitted under the law. The goods were, 

 however, short weight, as a pound package carried only 15.5 

 ounces. This short weight seems to have been characteristic 

 of this company's goods. According to Insecticide Act Judg- 

 ment No. 2, issued by the Department of Agriculture, under 

 date of December 20, 1912, the court condemned 3000 cases of 

 Paris green made by the S'herwin-Williams Company from 4 

 per cent to 13 per cent short weight. 



Arsenate oe Lead Paste. 

 Arsenate of lead paste may carr}' not more than 50 per cent 

 of water, and not less than 12.5 per cent of arsenic oxide, 

 equivalent to 8 15 per cent of arsenic, and water soluble arsenic 

 equivalent to not more than .75 per cent arsenious oxide, or .49 

 per cent arsenic. 



