362 ESSAYS and OBSERVATIONS 
Martis of different ftrengths, in common wa- 
ter: but, how. far this will hold in chaly- 
beate waters that are volatile, I have had no 
opportunity to try. 
I took a chopin bottle of this water, three 
months after it had been carried fifty fix 
miles, and poured one half of it into another 
cleanchopin bottle, and then corked them both 
very tight; the one bottle I fhook frequent- 
ly. and ftrongly for two days ; the third day I 
tried both, with powder of galls and o/. tart. 
p. 4.; with the galls, both gave a very deep 
blue; but the water which had been, fhaken,; 
with the ol. cart. rather. yielded. a. fainter 
green, than that which had not: [let both © 
bottles ftand corked up as before for ten or 
twelve days longer, without fhaking ; then 
tried them again with the galls and o/. tart. ; 
they both ftruck much the fame deep blue 
tho’ not fo deep as at firft; and, with ol. tart. 
the water which had not been fhaken, gaveva 
green, tho’ fainter than at firft; the other 
{carce offered any green; the clouds formed 
in it were fewer, and of a lighter yellow, 
than thofe of the other. From which it 
feems, that faking. lomewhat weakens the 
chalybeate 
