*4 tSSAYS AND OBSERVATIONS 



iiature of that I'ubftance, the nature and 

 tompofition of imrle will of confequeac^ 

 be evident 



An alkaline fait, added to the folu^ 

 tion of any other fubllance in an acid 

 liquor, inftantly precipitates that fub^ 

 fiance. The part of the marie diilol- 

 ved and carried off by the mm latic a^ 

 cid in Experiment 3. had no athaity to 

 an alkaline fait ' ; therefore a fait of 

 this nature, added to that Iblution, can- 

 not fail to feparate from it the folubJe 

 pait of cur fubjedl, and confsquently 

 to give us an opportunity of examining 

 it to greater advantage. 



EXPER. XV. 



With this view the forementioned fil- 

 tered liquor was mixed with a fmall quan- 

 tity of a folu'ion of fait of tartar. The 

 mixture bei^ame immediately milky and 

 turbid ; but in a (hort time recovered 

 its tranfparency by the copious preci- 

 pitation 



* See Exper. i. s. 



