Dr. Davy's observations 
364 
more when gently heated ; on cooling, a very few granular 
crystals were deposited. The solution was of specific gra- 
vity 1.9. After rest for several hours, it deposited a small 
number of minute and apparently cubical crystals. 
31 grains of muriatic acid, of specific gravity 1.58, carefully 
neutralized with magnesia, dissolved 40 grains of corrosive 
sublimate, and, when gently heated, 25 grains more. This so- 
lution remained transparent on cooling. When 5 grains more 
of the sublimate were added, these too were dissolved when 
heated ; on cooling, a good many spear-shaped crystals formed. 
The solution first made, when poured from one vessel into an- 
other, had an oily appearance, and was rather less fluid than 
concentrated sulphuric acid ; it was of specific gravity 2.83 ; 
gently evaporated, greyish pellicles formed, which rapidly 
deliquesced on exposure to the air. 
A saturated solution of muriate of potash formed of 21 
grains of water and 7 grains of dry muriate of potash, gently 
heated, dissolved 8 grains of corrosive sublimate. On cool- 
ing to 6o°, it deposited only a very few needle crystals ; but 
when cooled by means of ether to 50°, it became nearly 
solid, a mass of delicate needle crystals admitting of being 
inverted. 
A saturated solution of common salt, composed of 20 grains 
of water and 7 of salt, dissolved 32 grains of corrosive sub- 
limate at 6o°; gently heated, 3 grains more were dissolved, 
and remained in solution on cooling ; but, on a farther addi- 
tion of corrosive sublimate, the solution formed by heat, de- 
posited, on cooling, small rhomboidal crystals. The solution 
containing 33 grains of sublimate, was of specific gravity 
2.14. Like muriate of ammonia, the solubility of common 
