[ 649 ] 
thro’ an immenfe body of vitriol-ore, and the fup- 
ply of water is very large, 700 or 800 Hogfheads 
flowing in 24 hours. 
The water is of a pale-green colour, of an acid, 
fweet, auftere, inky and naufeous tafte. 
It is very ponderous, and inftantly betrays the great 
ftrength of the metallic impregnation by the hydro- 
meter; which, immerfed in this water, presently 
mounted above the ball, and flood in it nearly at 
the fame hight as in a folution of one ounce and 
fix drams of English vitriol in a quart of water. 
A little of the folution of pot-afhes inflantly pre- 
cipitates the metallic parts of this water in grains of 
three different colours, viz. ochre-coloured at the 
top, green in the middle, and white at the bottom : 
and the appearances with fpirit of hartfhorn were 
much alike, except that the grumes at the bottom 
participated of a mixture of a blue colour with the' 
white, indicating more clearly the mixture of Cop- 
per. 
But iron immerfed, above all other things, renders 
the contained copper confpicuous to the eye ; fora' 
clean knife, kept in it a few minutes, is covered with 
a bright copper-colour ; and needles and nails kept' 
immerfed in it a month in a phial were covered with 
a ruff partly yellow and fhining, which fee ms to be 
the copper, and partly a ferrugineous matter, as ap- 
peared by the magnet : and that it was partly cupre- 
ous appeared by the bright blue tindlure extracted by 
fpirit of hartfhorn from fuch parts of the ruff i as 1 
did not readily fly to the magnet; and, if one might 
rely on the Philadelphia experiment above-mentioned,, 
the proportion of copper fhoulcl be very large. 
