376 ESSAYS ayo OBSERVATIONS 
it as above, filled the vefel with it; it weigh- 
ed 25397 grains. 
(d) Turspay at mid-day, I ati feven 
pounds of the fingle lime-water, (¢) upon 
one pound of calcined oifterfhells, newly ta- 
ken from the fire, ftirring them well for 
fome time after; at three quarters paft fix 
in the evening, I decanted off, and filtered 
as above, the clear lime-water ; and having 
filled the vefel with it, found its weight to. 
be 25457 grains. 
HENCE it appears, that 100 cubical inches 
of the lime-water (4) exceeds, in weight, 
that quantity of fountain-water by 36 grains : 
_ (c) exceeds it by 77 grains, and (d) by 137 
grains. 
Tue fpecific gravity therefore of the weak 
lime-water (4) is to that of fountain-water 
nearly, as 704 to 703. The fpecific gravity 
of the fingle lime-water (c) is to that of com- 
mon water, nearly as 329 to 328; and the 
double lime-water (d) is in fpecific gravity 
to water nearly, as 186 to 185. 
Ir is obfervable that the fpecific gravities 
of the fingle and double lime-waters (c) and 
(d), are con§derably lefs than the fpecific gra- 
vities of the fingle and double lime-waters (a) 
and. 
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