on some Hydrargyro-Cyanurets. 359 



which, as in the former salt, was converted into chloride of 

 silver, and weighed 1 1*52 grs. = 2' 12 of cyanogen = 5 

 equivalents. 10 grains of this salt, therefore, contain, 



Of Water of crystallization, 1*20 = 8 equivalents. 



" Cyanuret of sodium, 0*77 = 1 equivalent. 



" Bi-cyannret of mercury , 8*02 = 2 equivalents. 

 Loss, . . 0,01 



To,oo 



The equivalent of this salt (in crystals) is 631'25; the 

 composition expressed in symhols is 2 (Hg + Cy 2 ) + (Na 

 + Cy). 



III. Hydrargyro-cyanuret of barium crystallizes from its 

 solution in large white transparent octohedrons, the angles 

 truncated. 



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

 connected with another weighed tube filled with fragments 

 of chloride of calcium ; the difference between the two 

 weights was 0"9 grains of water = 23 equivalents of water 

 of crystallization. 



The decomposed salt remaining in the tube was acted on 

 with muriatic acid ; the solution of chloride of barium thus 

 obtained was filtered, and a small quantity of sulphuric acid 

 added, sufficient to precipitate the whole of the baryta as 

 sulphate of baryta, which was placed on a weighed filter, 

 thoroughly dried, and then weighed 1-00 = 0'81 of cya- 

 nuret of barium = 2 equivalents. 



5 grains of the crystals of this salt were dissolved in 

 water, to which a solution of sulphur et of barium was 

 added ; the bi-sulphuret of mercury thus obtained, after 

 being well washed with distilled water on a weighed filter 

 and dried, weighed 2- 89 grs. = 3 - 14 grs. of bi-cyanuret of 

 mercury = 3 equivalents. 



The solution of cyanuret of barium left after the precipi- 

 tation of the bi-sulphuret of mercury was mixed with a 

 solution of nitrate of silver until all the cyanogen was 

 precipitated as cyanuret of silver, which, as in the former 

 analyses, was converted into chloride of silver by means of 

 rmriatic acid; after ignition short of fusion, it weighed 

 8 - 7 grs. = 8 equivalents of cyanogen. Therefore, 5 grains 

 contain : 



