[ +7 1 ] 
however, it exhibits no evidence, by any degree of 
She hue of that metal imparted to polilhed knives- 
immerfed in it, nor of fulphur, by difcolouring HU 
ver. It retained the above-mentioned take, on being' 
expofed feveral days in an open veflel; quite other- 
wile than happens to our ordinary chalybeates. 
It curdled with foap : it alfo curdled equal parts of 
milk, exhibiting a pretty clear whey. 
With fpirit of harifhorn, foirit of fal ammoniac, 
and the folution of potafhes, it' exhibited ochreous 
and green grumes, as the martial vitriol. 
Its appearances: with galls r and other auHeres, were 
very fingular, and worthy remark: for tormentil 
roots gave it. only a dilute ink colour, loon fading ; 
and green tea a dark dun colour, on Handing. It" 
had not blackened the corks, except perhaps one out 
of fix, that Hopped the bottles fent me; and when* 
the water was Hrfl poured out, it Hruck no more 
than a flightly bluiHi tinfture with galls; which 5 
tindture, on Handing all night, became like a dilute 
ink; but in a glafs expofed thirty-two hours, the 
galls Hruck the. dilute ink colour fooner : and in fome 
of the water, which I left expofed four days, and in 
fome of it, which I left in a phial corked, but only 
three quarters full, three weeks, the effe<H was very 
different ; for. to each portion of water fo expofed, 
as I have juH now mentioned, the galls imparted a 
raoH beautiful bright Hey blue ; which blue tincture, 
a little fpirit of vitriol inHantly deHroyed. 
Hence we may fee the fallacy of trading' to a few 
appearances, and the danger of radi conclusions, 
without repetitions of experiments and obfervations ; . 
which, if they had been omitted, I had been led to 
conclude- 
