[ 290 J 



to faturate, calculated as I mentioned in the above experiment on 

 lime, it will be found very exadly ; for there I ftated that 5760 

 grains of his fp. of fait contained 1348 of real acid, and confe- 

 quently 2740 contained 641,25. Now as 36 of acid take up 64 

 of vegetable alkali, 641,25 take up 1 140 of that alkali, and the 

 fum of both v. z. 1781, will be the quantity of muriated tartarin 

 thus formed. It is true he found its weight to be 1856 grains, 

 that is 75 grains more than by my calculation, but this excefs 

 moft probably was caufed by the muriated tartarin previoufly ex- 

 ifting in his alkaline folu! ion. His mode of obtaining what he 

 calls a pure alkaline fokuion renders this highly probable. 



To obtain a pure alkali (§ 33) he fimply pours cold water on 

 common pot-afli, and leaves them together, frequently agitating 

 them for 24 hours ; the folution thus obtained he evaporates to 

 drynefs, and then again treats the faline mafs with cold water, 

 but with a quantity of it too fmall to re-diffolve the whole ; fuch 

 was the alkaline folution he employed. Now though much of the 

 neutral falts contained in pot-afh may thus remain undiffolved, yet 

 fome certainly will be taken up, and among the reft muriated 

 tartarin, which is frequently found in vegetable afhes * and does 

 not require above three times its weight of water to diflblve it. 

 To this, then, the excefs of 75 grains may well be afcribed. 



The juftnefi of this conclufion is ftill further confirmed by exa- 

 mining his experiment on vitriolated tartarin. He faturatcd ano- 

 ther 

 * Wiegleb. ubev die Alkalifche Salze 98. 



