t 6 5° ] 
It is however certain, that, as in other copper- 
fprings, fo in this, here is a very confiderable pro- 
portion of the vitriol of iron combined with it, and 
by all experiments a much greater than of the vitriol 
of copper ; and accordingly, galls added to this water 
turned it firft blue (the charadteriflic of martial vi- 
triol) and then of a dilute ink-colour; and the corks 
in the bottles were blackened. 
But the genuine quality, as well as large propor- 
tion, of the impregnating fait, will further appear by 
the following analyfis of this water, viz. A pint of 
it, exhaled by a flow fire, left 400 grains of folid 
contents, which were partly green and partly ochre- 
coloured, with an intermixture of bluifli and of a 
rough, fweetifh tafte, like that of fal martis, and 
appeared to be chiefly faline, not leaving above four 
grains of indifloluble matter on difl'olving 15)6 grains- 
of it, and filtring. 
Thus it appears, that the proportion of vitriolic 
parts in this water is very large, viz. above fix drams 
to a pint or 3200 grains to a gallon; and confe- 
quently it is a flronger folution of vitriol than fea- 
vvater is of marine fait ; and, moreover, is truly 
confiderably the flrongefl of all the vitriolic waters, 
that have yet occurred to my obfervation ; for our 
Cronebaun water, in the county of Wicklow, gives but 
256 grains from a gallon; Haigh in Lancafhire, (the 
flrongefl; in Britain, that I know of) 1920 grains; 
Shadwell 1320; Kilbrew, in the county of Meath, 
1 530 from the the fame quantity ; fo that befides the 
copper to be obtained by immerfing bars of iron, as 
in our county of Wicklow water, this water offers 
to its proprietors another peculiar advantage, viz. an 
oppor- 
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