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good quantity of fpirit of Sal-Armo- 

 niac or fermented Urine, though 

 there would be a great commotion 

 with hiding and bubbles produced, 

 the Copper would not be precipita- 

 ted, becaufe this Urinous fpirit will 

 as well as the Salt, ( and much more 

 readily) diffolve the fame metal, and 

 it would be kept diiTolved notwith- 

 ftanding their operation on one ano- 

 ther J the intervening of which, and 

 their aftion upon the metalline cor- 

 pufcles, may be gathered from hence, 

 that the green folution , made with 

 fpirit of fait alone, will by the fuper- 

 vening urinous fpirits be changed 

 cither into a blewifh green, or^ if the 

 proportion of this fpirit be very 

 great, into a rich blew almoft like 

 ultramarine. And from thefe two 

 Experiments we may probably argue, 

 that when the Precipitation of a 

 metal &c. infues, it is not barely on 

 the account of the fuppofed Antipa- 

 thy betwixt the Salts, but becaufe 

 the caufes of that feeming Antipathy 



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