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SMITliSOXlAX MISCELLANEOUS COLLECTIONS 



VOL. 54 



The mean of the 18 values for the ratio is 159. 50L±. 0285. Hence 

 Ce = 140.28. 



Ill a hiter niemoii'. ]>i;niiU'r' gives additional analyses of cerium oxalate 

 and sulphate. The oxalate .tignres are as follows: 



Per cent. CcO.^. Per cent. C.O3. Ratio. 



47.070 29.548 159.304 



47.067 29.544 159.325 



47.077 29.478 159.682 



47.070 29.48G 159.638 



47.074 



Mean, 159.487, ± .0677 



Mean, 47.071 



Hence Ce = 140.26. 



If we give to Brauners earliest, single determination, the weight of 

 one experiment in the Brainier and Batek series, the values for this 

 ratio combine thus : 



Brauner, early 159.074, ± .0990 



Brauner and Batek 159.501, ± .0285 



Brauner, latest 159.487, ± .0677 



General mean 159.471. ± .0254 



In the memoir last cited Brauner also gives a series of determinations 

 based on the calcination of the octohvdrated cerium sulphate. In the 

 subjoined table I include two separate determinations given near the 

 beginning of the paper. All weights were reduced to a vacuum standard : 



Sulphate. CeO.. Per cent. CeO,. 



1.98989 .96175 48.332 



1.99154 .96251 48.330 



2.33919 1.13027 48.319 



1.95882 .94679 48.335 



1.20961 .58453 48.324 



1.54162 .74504 48.329 



1.67748 .81074 48.331 



2.02736 .97985 48.331 



Mean, 48.329, ± .0011 



Brauner rejects the third determination, a procedure which changes 

 the mean to 48. 330, ±.0009. We may adopt the latter and combine it 

 with another series, thus : 



Wyrouboff and Verneiiil 48.204, it .0095 



Brauner 48.330, ± .0009 



General mean 48.329, ± .0009 



' Zeitsch. anori?. Chetn., 34, 207. 1903. 



