302 THE ATOMIC WEIGHTS. 



Marignac 48.287, ± .0675 



Baubigny 48.280, ± .027 



Schutzenberger 48.257, zh .027 



General mean .... 48.269, ± .018 



From this point on the determination of these atomic weights is com- 

 plicated by the questions raised by Kriiss as to the truly elementary 

 character of nickel and cobalt. If that which has been called nickel 

 really contains an admixture of some other hitherto unknown element, 

 then all the determinations made so far are worthless, and the investiga- 

 tions now to be considered bear directly upon that question. First in 

 order comes Remmler's research upon cobalt.* This chemist, asking 

 whether cobalt is homogeneous, prepared cobaltic hydroxide in large 

 quantity, and made a series of successive ammoniacal extracts from it, 

 twenty-five in all. Each extract represented a fraction, from which, by 

 a long series of operations, cobalt monoxide was prepared, and the latter 

 was reduced in hydrogen after the manner of Russell. The actual deter- 

 minations began with the second fraction, and the data are subjoined, 

 the number of the fraction being given with each experiment: 



CoO. Co. Per cent. Co. 



2 0993S .07837 78.859 



3 15021 .11814 78.650 



4 22062 .17360 78.687 



5 3901 1 .30681 78.647 



< 6 2S820 .22661 78.629 



7 34304 .26968 78.615 



8 43703 .34321 78.532 



9 91477 .71864 78.560 



10 63256 .49661 78.508 



II 32728 .25701 78.529 



12 38042 .29S99 78.595 



13 16580 .13027 78.571 



14 1. 01607 -79873 78.610 .^ 



15 1-31635 I-03545 78.661 



16 9'945 .72315 78.650 



17 53100 .41773 78.668 



18 82381 .64728 78.572 



19 81139 .63754 78.574 



20 76698 .60292 78.610 



21 1. 13693 .89412 78.643 



22 2.00259 1.57495 78.646 



23. 1.04629 .82185 78.549 



24 48954 . .38466 78.576 



25 69152 .54326 78.560 



Mean, 78.613, ± .0099 

 *Zeit. .\iiorg. Chem., 2, 221. Also more fully in an Inaugural Dissertation, IJrlangen, 1891. 



