198 EXPERIMENTS on tne SWEET SPRINGS. 
ed it in a fhort time of a reddifh colour. ‘This was a proof 
that the waters contained fome kind of acid. 
5. Having made a folution of filver in the nitrous acid, 
and mixed a little of it with the water, it immediately be- 
came milky, and a white pulvurent precipitate enfued. 
This experiment fhewed by the whitenefs of the precipi- 
tate, that the waters contained nothing fulphureous, and 
by the pulvurency of the precipitate that the acid contain- 
ed in the waters was vitriolic. 
6. A folution of lead in the nitrous acid being mixed 
with the water, it became fomewhat milky, and a white 
precipitate was obferved. This experiment alfo fhews that 
the waters contain an acid, moft probably the vitriolic, 
and alfo that they contain caleareous earth. Soap is not 
readily mifcible with them. 
7. A folution of faccharum faturni in the nitrous acid 
being made, and lines marked upon paper with it, and 
placed over the water, the lines retained their former co- 
lour. ‘This experiment alfo fhews that the water contains 
nothing fulphureous. 
8. Having poured a little of the fpirit of falt into the 
water, after fome time a coloured precipitate was obferved, 
but as the waters did not_ftrike a green or blue colour, it 
fhewed that there was no copper in them, 
g. A folution of vitriol of copper mixed with the water 
produced a thick, green, curdly appearance, but did not 
become bluer. This experiment fhewed that there was no 
vol. alkali contained in them, 
10. The vitriolic acid mixed with the water fuddenly 
effervefced, and produced a heat which raifed the ther- 
mometer from 75 to 83, by applying the bulb to the 
outfide of the glafs. 
11. As the {pring is continually difcharging large bub- 
bles of air, which rifing from the bottom break upon 
the furface of the water, I was defirous of making fome 
experiments upon the air, in order to determine whether 
the 
