which Metals acquire by being calcined. 381 
If it arose from the water, then a quantity of water, equal to 
the weight by which the calx exceeds the metal, must be lost 
in the operation. To determine this, I performed a distillation 
in the following manner. 
I put 1000 grains of the same diluted vitriolic acid into the 
globe A of the same apparatus, then introduced the quantity of 
aqua kali puri found necessary to saturate it. The tube D 
was then bent downwards about the middle, and the apparatus 
brought to an horizontal position ; so that the bent part of 
the tube was in a perpendicular direction downwards : to this 
I affixed a small phial, and weighed the whole. I then put 
the globe B in a box filled with ice, and applied heat to the 
globe A, so as to distil over the water into the globe B, the 
liquor never being brought to the boiling point. When the 
matter in the globe A became dry, the heat was increased to a 
red one, to distil over likewise the water of crystallization. 
The whole apparatus was now weighed, and found not to 
have lost a grain ; nor was there any water in the phial. I 
then cracked the tube C, by applying a red hot iron to it, and 
letting a drop of cold water fall upon it. I next weighed the 
globe B with the water in it, then poured out the water, and 
let the glass dry. I weighed the glass ; the deficient weight 
from the former weighing, being the weight of the water, was 
10098 grains. 
I repeated the experiment, with this difference ; I put 1000 
grains of the same vitriolic acid into the globe A, then in- 
troduced the quantity of zinc sufficient to saturate it : I took 
the weight of the inflammable air as before, and found it nearly 
the same in weight and quality. The same quantity of aqua 
kali puri was then introduced through a funnel as in the 
mdccxcii. 3D 
