39$ ACIDULATED WAFERS 



medical ufcs, or crude and contaminated witty 

 vitriol. Yet for the fatisfadion of fome wh^ 

 have lately queftioned me on that head, I am 

 induced to repeat here briefly what 1 formerly 

 advanced* 



Let thfi water be boiled for a quarter of an 

 hour in a clean kettle ; then let it cool, ami 

 pour it into a glufs velll'l. Into another cup 

 pour frerti fpring water. Into each of thefc 

 veflcls pour & few drops of fpirit of wine, in 

 which a quantity of powder of galls has becrj 

 previoully macerated in a clofe vellel. 



If the boiled wateraflbrd not the fame quantity 

 of precipitated fediment as the frefli water, ir. 

 may be concluded to have contained iron diflolved 

 in aerial acid, and to be, of confequence, an acidu- 

 lated water. But if the fediment be the fame 

 in both vcflels, or only a little fcaqtier in that 

 which contains the boiled water, tbe boiled 

 water may then be concluded to contain a mi- 

 neral acid, and be unfit for medical purpotes, 

 till its nature be farther invHlii^ated. 



I'luch pint of the waterof Medvi contains three 

 gi.iins of iron. 



This water contains no extraneous matter 

 bolides the principles now enumerated ; and 

 11 of them are of lingular efficacy. The quan- 

 tity of fulited lime intermixed, ii fo very trilling. 

 lhat the laccharine acid fcurce detects its pre- 

 tence at the end of four and twenty hours ; ap(L 

 -jft Jio fixed alkuli can be obtained. The 



nitrou-j 



