362 Mr. George Henry Jackson, 



12 grs. (in crystals) of this salt were heated in a tube 

 connected with a weighed tube filled with fragments of 

 cMoride of calcium; the difference between the two weights 

 of the tube was 0*64 grs. = 3 equivalents. 



The decomposed salt was then heated with dilute 

 muriatic acid ; the solution, after being filtered and the 

 filter well washed with distilled water, was mixed with a 

 solution of carbonate of ammonia and boiled ; the lime was 

 thus precipitated as carbonate, which was placed on a 

 weighed filter, well dried, and weighed 1*03 grs. = 0*96 

 grs. of cyanuret of calcium = 1 equivalent. 



12 grains of this salt (in crystals) were dissolved in dis- 

 tilled water, to which a solution of sulphur et of calcium 

 was added until the whole of the mercury was precipitated 

 as bi-sulphuret, which, after being well washed on a weighed 

 filter with distilled water, was thoroughly dried, and 

 weighed 9*59 grs. = 10*42 grs. of bi-cyanuret of mercury = 2 

 equivalents. 



To the solution filtered from the bi-sulphuret of mercury 

 (consisting only of cyanuret of calcium) a solution of nitrate 

 of silver was added ; the cyanuret of silver thus obtained was 

 converted into chloride, thoroughly dried, and weighed 

 14-60 grs. = 2*70 of cyanogen = 5 equivalents : Thus, 

 then 12 grs. of this salt contain, 



Of Water of crystallization, 0*64 = 3 equivalents. 

 ,, Cyanuret of calcium, . - 96 = 1 equivalent. 

 ,, Bi-cyanuret of mercury, 10*42 = 2 equivalents. 



12-02 



The equivalent of this salt (in crystals) is 583*45. 



The crystals decrepitate strongly when heated. 



VI. Hydrargyro-cyanuret of magnesium crystallizes in 

 small colourless transparent octohedrons, from the mixture 

 of bi-cyanuret of mercury and cyanuret of magnesium. 



10 grains (in crystals) of this salt were heated in a tube 

 connected with another filled with chloride of calcium ; the 

 quantity of wafer which 10 grains were found to contain, by 

 weighing the tube before and after the experiment, was 

 0*14 grs. = 1 equivalent of water of crystallization. 



The magnesia contained in the decomposed salt left after 

 the above experiment, was dissolved in very dilute sulphuric 

 acid, the solution filtered, and the filter well washed with 



