468 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



total chlorine could be estimated as silver chloride. The weights were 

 as follows: 



Hence we have for the percentage of osmium and for the osmichloride 

 proportional to 100 parts of AgCl — 



Per cent. Os. AgCl-.HaU. 



43.446 51.266 



43.484 51.320 



43.4.58 51.254 



43.453 . 51.293 



Mean, 51.283, ± .0099 



In a later paper' two more reductions are given, in which only osmium 

 was estimated : 



Salt. 



2.6G87 

 2.6937 



These determinations, included with the previous four as one series, 

 give a mean percentage of Os in AmoOsCl(, of 43. 459, ±.0036. 



Secondl}', potassium osmichloride was treated in the same wa}', but 

 the residue weighed consisted of Os-l-3KCl. From this the potassium 

 chloride was dissolved out, recovered by evaporating the solution, and 

 weighed separately. The volatile portion, 4HC1, was also measured by 

 precipitation as silver chloride. In Seubert's first paper these data are 

 given : 



K.OsCk. Os. 



2.5148 

 2.1138 .8405 



Hence, with salt proportional to 100 paits nf Ag-ri in llio last column, 

 we have — 



Per cent. Os. Per cent. KCl. AgCl : Salt. 



31.000 84.091 



39.762 30.973 84.102 



Mean. 84.097, ± .0030 



' Liebig's Annalen, 261, 258. 



