J 
[ 6 S* ] 
opportunity of eredting a copperas- work or manufac- 
ture of vitriol, like the Hungarian vitriol j efpecially 
the vaft fupply of water and plenty of fuel in the place 
confidered. 
The great ftrength of the vitriolic impregnation, 
further appears from hence, that a little of this water, 
laid by in a clofet in a porringer, did, by the mere 
effluvia, without any lire, form large crufts of green 
vitriol on the brims and outlide of the veflel ; which 
vitriol, although it appears both by the colour, tafte, 
and the tincture ariling from the mixture of a folution 
of it with galls, to be of the ferrugineous kind, yet 
plainly fhews, that it partakes of a conliderable pro- 
portion of copper by imparting the copper- colour, 
when moiftened and rubbed on the blade of a knife, 
and moreover the indiffoluble parts of the fediment 
of this water left in the filtre on diiTolving it, exhi- 
bited a bright blue colour on being rubbed, and laid 
by with fpirit of hartfhorn ; an appearance peculiar to 
copper. 
This v/ater, though juftly fufpedted to be poi- 
fonous, if taken in its native ftrength, yet being 
lowered with common water it is frequently ufed for 
purging and vomiting the country people, and is 
ufeful in curing ulcers, and cutaneous disorders, and 
particularly for fore eyes. 
Dublin, 22d, 4th month, April, 
1 75 6 - 
