Fe en ad 
Ma. Wenzel found that 83,5 ers. of pure dry vegetable alkali 
were exactly faturated by 218,75 grs. of fpirit of vitriol; the 
folution being evaporated, and the refiduum expofed to a red 
heat, afforded him 152,5 grs. of tartar vitriolate. From whence 
he infers that this quantity contained 83,5 of mere alkali, and 
69 of the ftrongeft vitriolic acid. By which it would appear 
that, 
First. 100 parts pure vegetable alkali take 82,63 of the 
ftrongeft vitriolic acid, and afford 182,63 of tartar vitriolate. 
SEconDLy. That 100 parts tartar vitriolate contain 54,75 of 
mere alkali, and 45,25 of the ftrongeft vitriolic acid. Both 
which conclufions agree as nearly as can be expected with mine; 
‘and as the methods employed were fo widely different, this 
coincidence is a fure mark that the error, if any, muft be - 
very trifling. 
From the refult of this experiment Mr. Wenzel eftimates the 
quantity of the ftrongeft acid contained in half an ounce of his © 
{pirit of vitriol; for fince 218,75 grs. of this fpirit of vitriol 
contains 69 of the ftrongeft acid, 240 muft contain 75,75, or 
(by my experiment) 75,13 of the ftrongeft acid, which are equi- 
valent to about 84,19 of my ftandard, and too grs. of it con- 
tained 38,4 of my fiandard, its fpecific gravity was therefore 
1,3189. 
Mr. Wiegleb repeated this experiment exactly in the manner 
of Bergman, and yet the refult was very different, for he found 
that 
