BISMUTH. 233 



Omitting- the first and fifth means, the other data give a general mean 

 percentage of 89.659, ± .0012. 



The ratios now before us are as follows : 



(I.) Percentage of Bi in Bi203, 89.681, ± .0007 

 (2.) Bi.p3 : Bi2(SO,)3 : : 100 : 151.728, ± .0099 

 13-) 3Ag : BiCIa : : 100 : 98.003, d= .090 



For computation we have — 



O = 15.879, ±: .0003 Ag = 107.108, d= .0031 



S =31.828, ± .0015 Cl = 35.179,^.0048 



Hence, reducing the ratios — 



From (i) Bi = 207.003, ± .0150 



From (2) " =; 206.613, zb .0444 



I'rom (3) " = 209.370, zb .2847 



General mean Bi ^ 206.971, zb .0142 



If = 16, Bi = 208.548. 



Classen's data alone give Bi = 207.389, or, with = 16, 208.969. 

 Omitting this set of determinations and rejecting Dumas', the remaining 

 data give — 



I'rom BijOj .... Bi =r 206.512, zfc .0244 



From Bi2(SO^)3 " ^ 206.613, zt .0444 



General mean Bi = 206.536, zfc .0214 



If =-• 16, this becomes Bi = 208.11. Between this figure and Classen's, 

 future investigation must decide. The confirmation afforded by the 

 sulphate series is in favor of the lower value. 



