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 Hi in Bi 2 O 3 , 89.681, .0007 

 (2.) Bi 2 O 3 : Bi 2 (SO 4 ) 3 : : 100 : 151.728, .0099 

 13.) 3Ag : BiCl 3 : : 100 : 98.003, .090 



For computation we have 



O = 15.879, =b .0003 Ag = 107. 108, zh .0031 



8=31.828,^.0015 Cl = 35.179, .0048 



Hence, reducing the ratios 



From (i) Bi = 207.003, .0150 



From (2) .... " = 206.613, -444 



From (3) " = 209.370, .2847 



General mean Bi = 206.971, =b .0142 



If O = 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 



From Bi 2 O 3 Bi 206.512, .0244 



From Bi 2 (SO 4 ) 3 " = 206.613, .0444 



General mean Bi = 206.536, .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. 



