[ *4 ] 
then well corked, covering aftervvatds the corks 
clofely with rofin and wax, the water preferves its 
brifknefs and volatility a long while, and provided 
the bottle be kept corked, though half the water may 
have been drawn out, yet after keeping it months, 
nay many years, it will hill preferve its irony prin- 
ciple, fo as to turn with galls, purple, or dark blue. 
Experiments ■at the Spring Head. 
Experiment I. 
Half a grain of powdered galls turns a pint of So- 
merfham water of a dark purple. 
Experiment II. 
Brandy, or rum, drawn from oak calks, or an 
infufion of green tea leaves, turns it of a blackifh 
call:. 
Experiment III. 
Vegetable, nor mineral acids, caufe the lead al- 
teration in the water, which remains clear, and with- 
out the leaf! effervefcence. 
Experiment IV. 
Alcalies, whether volatile or fixed, caufe an ef- 
fervefcence and turn the water green and curdled. 
Experiment V. 
It mixes with milk without alteration. 
Experiment 
