238 Mr. Brett's Analysis of some 



from bisulphuret of mercury, together with the washmgs 

 were evaporated to dryness, and heated to a dull red heat in 

 a counterpoised platinum crucible : the resulting chloride of 

 sodium weighed 1-78 grs., the quantity by calculation being 

 1-87. 

 The results of experiment and calculation will therefore give 



Experiment. Calculation. 



Bicyanide of mercury 7*94? 8*13 



Chloride of sodium 1*78 1*87 



Loss '28 



10-00 10-00. 



The atomic representation of the salt will therefore be 



Bicyanide of mercury 255-72 = 1 atom. 



Chloride of sodium 53*65 = 1 atom. 



309-37 atomic weight of 

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



The ChlorO'Cyanide of Calcium and Mercury, 



This salt may be obtained by dissolving in water 14 parts 

 of chloride of calcium and 60 parts of bicyanide of mercury, 

 evaporating and crystallizing ; its crystalline form and lustre is 

 the same as the preceding : it is not deliquescent, is soluble in 

 alcohol, and its aqueous solution is precipitated by oxalate of 

 ammonia. 



Ten grains were analysed in the same manner as the last 

 salt. The quantity of bisulphuret of mercury obtained was 

 7*496 = 8*11 of bicyanide: the calculated proportion of bi- 

 sulphuret is 7*542 = 8*203 bicyanide of mercury. 



The quantity of chloride of calcium obtained was 1 -7, the 

 calculated proportion being 1*797. 



The results of experiment and calculation will therefore 

 give 



Experiment. Calculation. 



Bicyanide of mercury 8*11 8*203 



Chloride of calcium 1*70 1*797 



Loss *19 



10-00 10*000 



The atomic representation of the salt will accordingly be 

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

 Chloride of calcium 55*98 = 1 atom. 



311-70 atomic weight of salt. 

 And its symbol (Hg Cy -f Ca CI). 



