NICKEL AND COBALT. 



295 



Several samples of each oxide were taken, yielding the following data. 

 The separate samples are indicated by lettering : 



Nickel 



c. 



D. 



B. 





CoO. 



2. 1211 



2.0241 



I 2.1226 



I L9947 



{3.0628 



2.1167 



I.77I7 



1.7852 

 1.6878 

 2.2076 

 | 2.6851 



(2.1, 



46I 

 f 3.4038 



E. J 2.2778 

 (2.1837 



Ni. 



1.6364 



.6468 



5838 



7342 



7952 

 .6761 



.79" 

 .6845 

 .9030 



.7179 



5788 



1.6379 

 2.0873 



Cobalt. 



Co. 

 1.6670 



L5907 

 1.6673 



1.5678 



2.4078' 



.6638 



.3924 

 .4030 



.3264 



735 

 2.1104 

 1.6868 

 2.6752 



i.79 01 

 1.7163 



Percent. Ni. 



78.597 

 78.584 

 78.608 

 78.581 

 78.589 

 78.583 

 78.616 

 78.590 

 78.588 

 78.590 

 78.594 

 78.597 

 78.588 



Mean, 78.593, .0018 



Percent. Co. 



78.591 

 78.588 



78.550 

 78.598 

 78.614 

 78.603 

 78.591 

 78.591 

 78.588 

 78.592 

 78.597 

 78.598 

 78.595 

 78.589 

 78.596 



Mean, 78.592, .0023 



These percentages are practically identical, and lead to essentially the 

 same mean value for each atomic weight. 



In a later paper Russell* confirmed the foregoing results by a different 

 process. He dissolved metallic nickel and cobalt in hydrochloric acid 

 and measured the hydrogen evolved. Thus the ratio between the metal 

 and the ultimate standard was fixed without the intervention of any 

 other element. About two-tenths of a gramme of metal, or less, was 



* Journ. Chem. Soc. (2), 7, 494. 1867. 



