228 THE ATOMIC WEIGHTS. 



Obviously the single oxalate experiments of Jegel and of 

 Rammelsberg would exert no appreciable influence upon 

 these mean results. They may therefore be ignored. 



In combining all of these data in one general mean, we 

 may begin as usual by tabulating our ratios : 



(I.) BaSO^ : Ce2(SOj3 : : 100 : 123.019, d= .113 



(2.) BaSO^ : CeO^ : : 100 : 49.360, ± .035 



(3.) BaClj : CejfSOJj : : lOO : 91.625, dr .016 



(4.) AgCl : CeOj : : lOO : 40.469, zt .0415 



(5.) Percentage CeOj from anhydrous sulphate, 60.271, ± .001 



(6.) " " " oxalate, 63.4316, zfc .0032 



(7.) " CO2 " " 48.2546, ± .001 



These ratios give us four values for the molecular weight 

 of CeO 2 and two values for Ce, (804)3: 



From (2) CeO^ = 172.218, ± .124 



« (4) " = 173.663, dr .179 



" (5) " =169.651,^.034 



" (6) " = 173.068, ± .033 



General mean " = 171.490, rb .023 



From (I) Ce,j(S0j3 = 567.234. ±: -522 



" (3) " =570.375,^.165 



General mean_ " = 570.093, ± .156 



Hence we have three independent values for the atomic 

 weight of cerium, as follows : 



