Re eye PSs 
: a 
PHYSICAL ann LITERARY. 349 
the double lime-water (d), which had f{tood 
24 hours on the lime, gave eight grains of 
a white powder. 3 
Ir was obfervable, that thefe three lime- 
waters retained the tafte of the lime, after 
being mixed with the falt of tartar, and this 
equally after precipitation, as before it. 
‘Since the earthy powder precipitated by 
thefe different lime-waters, proceeds whoily, 
or almoft wholly, from the waters, and not 
from the fixed alcaline falt; * thefe experi- 
ments fhew, beyond doubt, that double lime- 
water may contain thrice as much lime, as 
lime-water made by pouring, on quick-lime, 
512 times its weight of water. 
IV. 1. Monpay 24th December, at eight 
in the evening, I poured upon a dram of freth 
calcined oifter-fhells, reduced to a powder, 
520 drams of boiling water. 
AT 
* What proves this, is, that the calcarious matter preci- 
_ pitated by mixing falt of tartar with lime-water, is greater 
or lefs, in proportion to the ftrength and quantity of the 
lime-water; but not in proportion to the quantity of the 
falt. Thus 12 grains of falt of tartar, mixed with four 
ounces of {trong lime-water, yielded as much of this matter, 
as the fame quantity of this lime-water, mixed with 18 
re grains of the faJt. 
