156 Remarks on Priestley’s Analysis 
I found it at first. These little inequalities of ex- 
siccation can hardly be avoided. 
EXPERIMENT III. 
I dissolved 100-grains of calcined chalk in dilut- 
ed muriatic acid, with the loss of 41 grain sof car- 
bonic acid. The lime was then precipitated by sul- 
phuric acid; and the residuum in the filtre, being 
properly washed and dried, weighed........ 97 grains. 
But, as a portion of this selenite is solu- ; 
ble in water, it was necessary to evapo- 
rate the lixivium, which farther produced 43 
140 grains. 
As this artificial gypsum, when well dried, contains, 
according to Kirwan, 42 grains of earth, 39 of acid, 
and 19 of water in the hundred, the above 140 
grains contain 58.8 grains of pure lime, and the 
carbonic acid being 41 grains: hence, 58.8 + 41 =. 
99-8 grains; which very nearly corresponds with 
the weight of the chalk. To assure myself that I 
had hit on the right degree of exsiccation, I calcined 
some of the sulphate of lime, which thereby lost its 
water, amounting to 183 per cent. : 
EXPERIMENT IV. 
I dissolved 100 grains of well dried chalk in ace- 
tous acid; 47 grains of carbonic acid gas were dis- 
engaged. The acetate of lime, which was formed, 
was carefully collected and calcined in a crucible, 
with a sufficient heat to destroy the acetous acid ; 
and to expel the carbonic acid, which is formed 
