170 



THE ATOMIC WEIGHTS. 



We now have six ratios involving the atomic weight of mercury, as 

 follows : J 



) Per cent, of Hg in HgO, 92.595, ± .0003 

 ) Per cent, of Hg in HgS, 86.2127, ± .0027 

 ) Per cent, of Hg in HgCl^, 73.826, d= .0011 

 Per cent, of Hg in HgBr^, 55.556, ± .0012 

 Per cent, of Hg in HgCjNj, 79.339, ± .0004 

 2Ag : Hg : : 100 : 92.660, 4= .0051 



The calculations involve the followino; values 



O = 15.879, ± .0003 



Ag=r 107.108, ± .0031 



CI = 35-179, ±.0048 

 Hence the values for mercury are — 



Hr = 79.344, zh .0062 

 S = 31.828, zh .0015 

 C = 11.920, ± .0004 

 N =13.935, ± .0021 



From (i) Hg = 198. 557, ± .0084 



From (2). 

 From (3). 

 From (4) 

 From (5). 

 From (6) . 



= 199.027, rh .0406 

 = 198.482, ± .0285 

 = 198.364, zh .0170 

 = 198.568, =b .0170 

 = 198.493, ±.0124 



General mean Hg = 198.532, zh .0059 



If = 16, Hg = 200.045. 



But according to Hardin the value derived from the analyses of mer- 

 curic oxide is untrustworthy. Rejecting this, and also the abnormally 

 higli result from the sulphide series, the general mean of the four re- 

 maining values is — 



Hg ^ 198.491, zh .00S3, 



or, with = 16. Hg = 200.004. These figures seem to be the best for 

 the atomic weight of mercury. 



