C I2 5 ] 
xo. Immediately after the affuflon of ol. tart. p. d. 
to the water, galls were added to the mixture, which 
tinged it of a deep and bright red colour. After 
{landing for fome time, there were red clouds pre- 
cipitated to the bottom, and the water continued of 
a dufky opake red colour. 
1 1. There is a fmall brook, formerly mentioned, 
which runs near by thefe fprings ; into which the 
water, that flows from them, is difcharged. I ob- 
ferved the flones and channel of this brook all tinged 
with ochre of a deep yellow colour, fo far up as the 
water of thefe fprings flowed into it ; but the chan- 
nel, which the mineral water ran over before it was' 
mixed with the water of the brook, was very little 
or nothing difcoloured with ochre. As I conjectured 
what this was owing to, I afterwards took two equal 
quantities of the mineral water, into one of which I 
put an equal quantity of common water. In two 
hours the mixture became lefs tranfparent, and ap*- 
peared yellowifh, while the Ample mineral water 
retained its clearnefs. Next day there was much ochre 
feparated from the mixture, which fubflded to the 
bottom of the glafs : but the unmixed mineral water 
remained Hill clear and colourlefs, as at firft. 
All chalybeat waters feparate their ochrous part 3 , 
when expofed fome time to the air ; but this fepara- 
tion is made fooner by the commixture of feveral 
kinds of falts. Thus we fee the ochre in this water 
is immediately feparated and precipitated by the fo- 
lution of faccharum Saturni. 
The oil of tartar caufes a precipitation of thefe 
ferrugineous parts in the fame manner. Which parts 
mud 
