[ 122 ] 
3. A quantity of the water being thoroughly 
tinged with galls, was allowed to fland 24 hours: 
being then filtrated thro’ brown paper, the water, 
tho’ almoft quite colourlefs, would not again receive 
any tindture with galls. 
4. After elixation the water became of a turbid 
yellow colour with ochre, and afforded very little 
tindture w r ith galls. 
5. A folution of fal Martis, chemically prepared, 
being mixed with galls, immediately turned of a 
bright dark blue colour, exadtly fimilar to that pro- 
duced in the water. 
6. A folution of common and rock alum was no- 
ways changed in its colour with galls. 
7. A folution of fal Martis and alum being mixed 
in equal quantities, the mixture was turned of a 
bright blue colour with galls ; yet not of fo deep a 
hue, but of a more diluted colour than the folution 
of fal Martis, without alum. 
From thefe experiments we muff: firft of all ob~ 
ferve, that the colour, which thefe waters afford with 
galls and pomegranate-flowers, is very uncommon. 
The more iron, that any mineral water contains, it 
will afford the deeper colour with fuch aftringents : 
but tho’ I have tried this experiment upon a great 
many of the ferrugineous waters in Scotland, and alfo 
upon the water of fome of the foreign Spaws, I never 
obferved one, that afforded fo deep a colour as this, 
which we now confider. Some of the weakeft of 
them gives only a red or faint purple tin&ure, and 
the ffrongeft only a deep purple : but I never faw or 
heard of any chalybeat water, but this, either in 
Scotland 
