the Action of Water on White Precipitate. 431 



From this result we can easily calculate the quantities of 

 chlorine and mercury the residue contains, for, 



Let m — the residue = 94-01 



x = the quantity of chlorine 



y as the quantity of mercury 



a = atomic weight of chlorine = 35*42 



b = atomic weight of mercury = 202*8. 



This is (1.) x = m — y 



x a 



and (2.) — ss — - by other processes. 



Then '• = -^- .*. Ibm = (a+2b)y 



m—y a 



, 2bm 



ana y = — 7-. 



y a + 2b 



We thus find 100 of yellow powder, to contain 



Mercury 86*46 



Chlorine 7*5.5 



E. — 105*28 grains of yellow powder were dissolved in mu- 

 riatic acid, and the solution having been somewhat diluted, was 

 decomposed by a current of sulphuretted hydrogen gas. The 

 perfectly black sulphuret was collected on a weighed filter, 

 and the liquor evaporated to dryness, and the residual sal- 

 ammoniac weighed : 



The filter and sulphuret 126*71 



Filter 23*00 



Sulphuret of mercury 103*71, consisting of 



Sulphur 14*22 



Mercury 89*49. 



The sal-ammoniac weighed 12*86 grs. consisting of 



Chlorine 8*50 



Hydrogen *24 



Ammonia 4*12. 



Therefore, the yellow powder consisted of 

 in 105*28 parts, in 100 parts, 



Mercury 89*49 Mercury 85*00 



Ammonia 4*12 Ammonia 3*91. 



Summing up these different results, we have 



Process. Mercury. Chlorine. Ammonia. 



A 88*381 8*374 



B 87*95 8*44 



C 86*23 7*77 3*83 



D 86*46 7*55 



E 85*00 3*91. 



