i %6 Mr. Walker's Experiments on 
kept and used at the ordinary temperature of the air at any 
time, the specific gravity of the liquor should be 1,490, at 8o° 
of heat* 
The liquor, when sufficiently evaporated, should be set by to 
crystallize ; and the crystallized mass, as soon as cold, should 
be reduced to very fine powder, in a glass or stone-mortar. 
The muriate of lime, in its solid state, being a hard brittle sub- 
stance, it is necessary commonly to immerse the vessel contain- 
ing it in water sufficiently warm to loosen the mass, in order to 
remove it out of the vessel, to pound it. 
When the muriate of lime is intended to be preserved for 
future use, the powder should be put directly into a bottle, 
and closely stopped from the air; for this salt is extremely 
deliquescent, and hence, a dry state of the atmosphere should 
be chosen for preparing it. 
These experiments I shall divide into two series ; the first 
of which consists of those made with the muriate of lime 
prepared so as to be used in winter only, that is, of the 
strength of 1,450. 
The second series consists of those made with the same 
salt prepared so as to be kept for use at any time, the strength 
of which is 1,490. 
* Muriate of lime evaporated to the strength of 1,400, gives (if cooled slowly in 
a cold air, viz. -j- 20°) perfect crystals ; this is the fittest state of the salt forproducing 
cold. 
