138 
STRONTITES. 
acted on. At length a jelly is formed, which becomes perfectly fluid 
by the addition of water; a minute portion of powdery matter, 
which probably came from the crucible, remained undiffolved. 
Dr. Hope was not able to vitrify strontites with the flame of the 
blow-pipe. This makes it emit a brilliant light. (Fourcroi.) 
The constituent parts of natural carbonat of strontites, are by the 
above experiments, in 100 parts, 
Earthy basis, 
61.21 
Carbonic acid, 
30.20 
Water, 
8.59 
100.00 
6. Hot water diffolves a much larger quantity of pure or caustic 
strontites than cold water, and in cooling deposites the superfluous 
quantity in crystals. It is very remarkable by the great quantity of 
heat which is extricated from it in flaking. A few small bits thrown 
into a flask of hot water, make it boil violently, and the ebullition 
may be kept up for a great length of time by fresh additions. Nine 
ounces and a half of water yielded by refrigeration rather more than 
an ounce of transparent crystals. A hundred grains of these crystals 
contain 68 of water. one part of which is easily expelled from them 
by heat, at first without fufion, but at last a part of the water adhering 
more strongly, makes them undergo a watery fusion, which ceases 
when the water is totally evaporated. Theſe crystals muſt be kept 
in phials very closely stopped, otherwise they attract carbonic acid, 
and fall down in powder. The great quantity of water rendered 
solid in thefe crystals, and so strongly united, accounts for the great 
heat produced by mixing calcined strontites with water. 
One ounce of water at 60° Fahrenheit, diffolves flowly 8.5 grains 
of thefe crystals. One ounce of water kept boiling difsolved no less 
than 218 grains. Thefe folutions have all the alkaline qualities of 
lime-water.