302 



THE ATOMIC WEIGHTS. 



Marignac 48.287, .0675 



Baubigny 48.280, .027 



Schutzenberger 48.257, .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 : 



*Zeit. Anorg. Chem., 2, 221. Also more fully in an Inaugural Dissertation, E)rlangen, 



