450 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



pounds of ruthenium were aiuilvzetl by reduction in a stream of hydro- 

 gen with the following results : 

 First, reduction of RuO„ : 



Mean, 76.060, ± .0040 



Second, reducti<in of the salt PiuClg.^O.H.O : 



Per cent. Ru. 

 39.78 

 39.66 



Mean, 39.72, ± .0405 



Third, reduction of RuCl3.N0.2NH,Cl : 



Per cent. Ru. 

 29.44 

 29.47 



Mean, 29.455. ± .0101 



To reduce these ratios we have — 



CI = 35.4584, ± .0002 

 N =14.0101, ±.0001 

 H = 1.00779, ±: .00001 



Hence, 



From RUCI3.NO.2NH4CI Ru = 101.622, ± .0378 



RuO, 101.608, ± .0178 



RuCl,.NO.H„0 101.739, ± .1242 



General mean, Ru = 101.661, ib .OIGO 



More data arc needed in order to thoroughly establish the atomic 

 weight of ruthenium. 



