[ *07 ] 
acid than is neceflary to diffolve the unneutralized 
earth, and to ufe as little water in washing out the 
folution as poffible; for otherwife a good deal of the 
felenite, which is depofited in the evaporation of 
mod: water, will be diffolved ; the earth of which 
will be precipitated by the fixed alcali, and by that 
means make the quantity of unneutralized earth ap- 
pear greater than it really is.. 
It appears from thefe experiments, that the un- 
neutralized earth is intirely precipitated from thefe 
three waters, by the addition of a proper quantity of 
lime water; as the' trifling quantity found to be de- 
pofited, on the evaporation of two of them, mod 
likely proceeded only from not expofing the water to 
the air, long enough for all the lime to be precipitated. 
So that I think it feems reafonable to conclude, that 
the unneutralized earth, in all waters, is fufpended 
merely by being united to more than its natural pro- 
portion of fixed air. 
To return to Rathbone-place water; it appears 
from the foregoing experiments, that one pint of it, 
or 7315 grains, contains, fird, as much volatile al- 
cali as is equivalent to about grains of volatile fal 
ammoniac : fecondly, 8 grains of unneutralized 
earth, a very fmall part of which is magnefia, the 
red a calcareous earth : thirdly, as much fixed air, 
including that in the unneutralized earth, as is 
contained in 19 grains of calcareous earth: 
fourthly, 1 of felenite: fifthly, 7 Jl of a mix- 
ture of fea fait, and Epfom fait; and the whole fo- 
lid contents of 1 pint of the water is 17 4. grains^ 
One pint of water, from the pump in Marlbo- 
rough-dreet, contains 1 T %_. grains of unneutralized 
d P 2 earh 
