on some Hydrargyro-Cyanurets. 361 



The decomposed salt resulting from this experiment was 

 treated in exactly the same manner as in the corresponding 

 salt of barium ; the strontium was here estimated as sul- 

 yhate of strontia, which, after being thoroughly dried on a 

 weighed filter, weighed 15 grs. = M grs. of cyanuret of 

 strontium = 1 equivalent. 



10 grs. (in crystals) of this salt were dissolved in water, 

 to which a solution of sulphur et of strontium was added ; the 

 precipitate, after being well washed on a weighed filter 

 with distilled water and dried, weighed 8-0 grs. of bi-sul- 

 phuret of mercury = 8-87 grs. of bi-cyanuret of mercury = 2 

 equivalents. 



To the solution filtered from the bi-sulphuret of mercury 

 (which consisted only of cyanuret of strontium) a solution of 

 nitrate of silver was added, by which the whole of the 

 cyanogen was precipitated as cyanuret of silver, which was 

 converted into chloride of silver in the usual manner, the 

 chloride of silver (after the necessary precautions had been 

 observed to insure perfect dryness) weighed 11*4 grs. = 

 9-1 grs. of cyanogen = 5 equivalents. 10 grs. (in crystals) 

 of this salt contain, 



Of Water, . . 0'04 



„ Cyanuret of strontium, 110 = 1 equivalent. 

 ,, Bi-cyanuret of mercury, 8-87 = 2 equivalents. 



10-01 

 The equivalent, of this salt is 579 '76 ; its composition 

 may be expressed in symbols thus, 2 (Tig + Cy 2 ) + 

 (Sr + Cy). 



100 grs. of distilled water, at the temperature of 60° F., 

 dissolve 17 grs. of this salt. The solution precipitates a 

 salt of lead white, which is insoluble in an excess of the 

 precipitant; when added to a solution of chloride of manga- 

 nese, a white precipitate falls, which quickly turns brown ; 

 with aproto-salt of iron, an orange precipitate falls, which 

 is quickly changed into Prussian blue ; it gives white pre- 

 cipitates with solutions of sulphate of zinc, and tartar emetic ; 

 the precipitate with the latter solution is completely soluble 

 in an excess of the precipitant ; the solution gives no pre- 

 cipitate with a solution of arsenious acid. 



V. Hydrargyro-cyanuret of calcium crystallizes in octohe- 

 drons, colourless and transparent, from the mixed solution. 



