ATOMIC WEIGHTS 



433 



to two experiments upon the calcination of nickel sulphate, and his data 

 are as follows : 



6.2605 grm. NiSO« gave 3.0225 NiO. 48.279 per cent. 

 4.4935 " 2.1695 " 48.281 



Mean, 48.280 



Hence Ni = 58.741. 



Zimmermann's work, published after his death by Kriiss and Alibe- 

 goff,^ was based, like Eussell's, upon the reduction of cobalt and nickel 

 oxides in hydrogen. The materials used were purified with great care, 

 and the results were as follows : 



Nickel. 



Hence m = 58.704. 



Cobalt. 



.0006 



Mean, 78.635, ± .0002 

 Hence Co = 58.889. 



Shortly after the discovery of nickel carbonyl, ^10^04, Mond, Langer 

 and Quincke ' made use of it with reference to the atomic weight of 



1 Ann. Chem., 232, 324. 1886. 

 ''Journ. Chem. Soc, 57, 753. 1890. 



