ATOMIC WEIGHTS 



Mean, 78.557, ± .0319 



Hence ]Sri = 58.616. 



To these data of Kriiss and Schmidt the remarks already made con- 

 cerning Eemmler's work seem also to apply. The variations appear to 

 be fortuitous, and not systematic, although the authors seem to think 

 that they indicate a compositeness in that substance which has been 

 hitherto regarded as elementary nickel. In view of all the evidence, 

 however, I prefer to regard their varying estimations as affected by acci- 

 dental errors, and to treat their means like others. On this basis, their 

 work combines with previous Avork as follows, Schutzenberger's measure- 

 ments of the ratio ISTiO : Ni being assigned equal weight with those of 

 Mond, Langer and Quincke : 



Russell 78.593, ±: .0018 



Zimmermann 78.582, ± .0006 



Mond, Langer, and Quincke 78.545, ± .0061 



Schutzenberger 78.534, ± .0061 



Kriiss and Schmidt, reduction series.. 78.444, it .0166 



Kriiss and Schmidt, oxidation series.. 78.557, ± .0319 



General mean 78.570, ± .0006 



