376 



BOARD OF AGRICULTURE. 



Arsenious Oxide (white arsenic) 



Cupric Oxitle , 



Calcium Oxide (lime) , 



Sulphuric Acid (anhydride) .... 



Carbonic Acid , 



Acetic Acid 



"Dead oil" (by difference)* 



Insoluble residue , 



Water of hydration (calculated) 

 Moif ture .... 



bO 



s . 



- o 



— tn 



1.20 



29.41 

 42.05 



6.00 



18.91 

 3.43 



* Also determined approximately. 



The Paris Green is mainly an aceto-arsenite of copper, or in other 

 words, a compound of acetic acid, arsenious acid and copper. The 

 London Pnrple is composed mainly of arsenite of lime, containing, 

 besides, quite an amount of coloring matter. 



Hammond's Slusr Shot does not make so srood showins: as either 

 of the other preparations, as over nine-tenths (exactly 90.37 per 

 cent) of it appears to be nothing but plaster. It contains only 1.2 

 per cent of arsenious acid, and approximately 5 00 per cent of a 

 heav3'oil. Paris Green contains almost fort\' (40) times as much arsen- 

 ious acid as Hammond's Slug Shot, and Londou Purple over forty- 

 six times as much. Or to put the relations in another form, two 

 and one-half pounds of Paris Green, or two and one-fifth pounds of 

 London Purple would furnish the arsenious acid for one hundred 

 pounds of Hammond's Slug Shot. The latter contains some heavy 

 oil which is not found in the other preparations. 



