240 Mr. Brett*s Analysis of some Double Salts of Mercury, 



The atomic representation of the salt will therefore be 

 Bicyanide of mercury ... 255'720 = 1 atom. 

 Chloride of barium ...... 104*132 = 1 atom. 



359-852 atomic weight of 

 double salt. And its symbol (Hg Cy + Ba CI). 



The ChlorO'Cyanide of Strontium and Mercury, 



Obtained by dissolving together in water 19 parts by 

 weight of chloride of strontium and 60 parts of bicyanide of 

 mercury, evaporating and crystallizing. This salt easily cry- 

 stallizes in long flat quadrangular prisms,having a silky lustre; 

 it dissolves readily in weak alcohol, and very well marked 

 crystals may be obtained from such a solution : the salt is not 

 deliquescent. 



Ten grains submitted to analysis yielded 6*95 grains of bi- 

 sulphuret of mercury = 7*55 bicyanide, the calculated propor- 

 tions being 7'01 bisulphuret = 7*62 bicyanide of mercury. 



The chloride of strontium obtained weighed 2*37 grains, 

 the calculated proportion being 2*38. 



The results of experiment and calculation therefore give 



10-00 10-00 



The atomic representation of the salt will accordingly be 

 Bicyanide of mercury... 255*72 = 1 atom. 

 Chloride of strontium... 79-32 = 1 atom. 



335*04? atomic weight of 



2 



double salt ; and its symbol (Hg Cy + Sr CI). 



There yet remain to be examined the compounds formed 

 by the union of the different iodides of the alkaline and 

 earthy metals with bicyanide of mercury ; these however I hope 

 to make the subject of another communication. 



January 8th, 1838. R. H. B. 



