300 THE ATOMIC WEIGHTS. 



Parpureo-cobalt chloride, Co.j{NH^^^Cl^. 



Salt. Co. Percent. Co. 



•9472 .2233 23.575 



.8903 .2100 23.587 



•6084 .1435 23.586 



.6561 .1547 23.579 



.6988 .1647 23.569 



.7010 .1653 23.581 



Mean, 23.5795, zt .0019 



The last series may be combined with Sommaruga's, thus : 



Sonimaruga 23.817, ± .006 



Lee 23.5795, =b .0019 



General mean 23.6045, zb .0018 



Baubigny's* determinations of the atomic weight of nickel are limited 

 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, 48.2S0 



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

 goff, t was based, like Russell'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. 



NiO. 

 6.0041 

 64562 

 8.5960 

 4.7206 

 8.2120 



9.1349 



10.0156 



4.6482 



8.9315 



10.7144 



3.0036 



.0006 



* Conipt. Rend., 97, 951. 1883. 

 t Ann. der Chem., 232, 324. iS 



