OF STRONTIAN. 289 



formed by dissolving phosphate of strontian in 

 phosphoric acid, and mixing the solution with 

 alcohol. The biphosphate precipitated in the 

 state of a fine white soft powder, which had an 

 acid taste, and strongly reddened vegetable blues. 

 15 '75 grains of this salt, dried in the open air, 

 lost, when exposed to an incipient red heat, 2-25 

 grains of water. From this it is obvious that 

 the constituents of the salt are 



2 atoms phosphoric acid 7 



1 atom strontian . 6-5 



2 atoms water . 2-25 



15-75 



When the alcoholic solution, from which the 

 biphosphate of strontian had precipitated, was 

 concentrated and set aside, it deposited a num- 

 ber of transparent crystals, which had a very 

 acid taste, and consisted of phosphoric acid and 

 strontian. The result of an analysis of them led 

 me to consider these crystals as a quadrophos- 

 phate of strontian j but the quantity which I 

 possessed was too small to enable me to deter- 

 mine the point in a satisfactory manner. 



6. Arseniate of strontian. This salt was ob- 

 tained by mixing together solutions of nitrate of 

 strontian and arseniate of soda in the atomic pro- 

 portions. No immediate precipitate appeared ; 

 but in 24 hours a number of small crystals were 



VOL. II. T 



