324 



THE ATOMIC WEIGHTS. 



K,OsCU. 

 1. 1863 



.9279 

 1.0946 

 1.6055 



•4495 



.8646 



.7024 



1.2742 



1.0466 



2.2032 

 2.0394 

 2.7596 



2.4934 

 2.8606 

 2.8668 

 1.2227 



Mean of all nine determinations, 30.941, ± .0079 



The single percentage of osmium in the earlier memoir is obviously to 

 be rejected. 



The ratios to examine are now as follows : 



(i.) Per cent. Os in Am20sClg, 43.459, ± .0036 

 (2.) 6AgCl : AirijOsClg : : loo : 51.283, rb .0099 

 (3.) 4AgCl : K.^OsClg : : lOO : 84.097, dz .0030 

 (4.) Per cent. Os in ICpsClg, 39-553, ± -0052 

 (5.) Per cent. KCl in K.psClg, 30.951, zh .0079 



To reduce these ratios we have — 



Hence there are five independent values for osmium, as follows 



From (I ) Os = 190. 11 1, ifc .0300 



From (2) " = 190.870, zh .0901 



From (3) " = 189.9^8, zb .0371 



From (4) " = 188.914, zh 0243 



From (5) " ^ 189. 57[, zh .0928 



IfO 



General mean Os = 189.546, zb .016^ 



16, Os = 190.990. 



