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Salt of Tartar is teft at the bottom* 

 but a good part of the Sal Armoniac 

 is left behind with it 3 I fufpe&ed the 

 caufe might be, that Sal Armoniac^ 

 by the operation of the Alkaly of 

 Tartar, is reduced into Sea-falt, and 

 Urinous or fuliginous Salt, as 'twas at 

 firft compofed of thofe differing In- 

 gredients 5 and that by this means 

 the volatil Salt being loolened or 

 disintangled from the reft, and being 

 of a very fugacious Nature , flyes 

 eafily away it felf, without (laying 

 long enough to take up any other 

 Salt with it. And therefore, if this 

 Analyfis of the Sal Armoniac could 

 be prevented, it feemed not impo£ 

 iible to me, that fome part of the 

 Salt of Tartar, as well as of Colco- 

 thar and Steel, might be carried up 

 by it : And accordingly having can- 

 fed the Ingredients to be exceedingly 

 well dryed, and both nimbly and 

 carefully mixt, and fpeedily expofed 

 to the fire, I have fometimes had a 

 portion of Salt of Tartar carried up 

 with the Sal Armoniac : but this hap- 

 pened 



