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PHYSICAL ann LITERARY. 355 
ral principles, and confequently diflolves and 
carries a greater quantity of thefe principles 
along with it. Whence it is likewife evi- 
dent, that experiments made on this water at 
different times, will not always exactly cor- 
refpond, but will vary more or lefs, in pro- 
portion to the mineral contents of the water. 
8. Tue tenth experiment feems to be an 
indication, that this water contains a vitriolum 
Martis nativum ; no other mineral water, that 
I know of, turns green, with ol. tart. p. d.: 
but, when this oil is dropt into a folution of 
vitriolum Martis, it becomes green. And 
tho’ there is no vifible effervefcence in this 
experiment (10.), yet the many air-bubbles 
generated feems to be the effect of the alka- 
li’s uniting itfelf to the acid, which kept the 
chalybeate principle diffolved, and_ which 
chalybeate principle, being now by the o/, zart. 
difengaged from its diffolvent, appears in the 
form of green or yellow clouds ; and at laft is 
found, at the bottom of the glafs, under the 
_ form of a fubtile okry, or bolar earth. 
_ Iv may perhaps be faid, that fince there is 
;. probably alum in this water, the air-bubbles 
are generated by the alkali’s uniting itfelf to 
the acid of the alum. To deftroy this fup- 
pofition 
