ATOMIC WEIGHTS 



237 



According to Himtington's own calculations, these experiments fix the 

 ratio between silver, bromine and cadmium as Ag : Br : Cd : : 108 : 80 : 

 113.31. 



In 1890, Partridge' published determinations of the atomic weight of 

 cadmium, made by three methods, the weighings being reduced to a 

 vacuum standard throughout. First, Lenssen's method w^as followed, 

 viz., the ignition of the oxalate, with the subjoined results: 



1.09S9S 

 1.21.548 

 1.10711 

 1.17948 

 1.16066 

 1.17995 

 1.34227 

 1.43154 

 1.53510 

 1.41311 



CdO. 

 .70299 

 .77746 

 .70807 

 .75440 

 .74327 

 .75471 

 .85864 

 .91573 

 .98197 

 .90397 



Per cent. CdO. 



63.966 



63.962 



63.957 



63.959 



63.959 



63,964 

 • 63.968 



63.970 



63.968 



63.971 



Mean, 63.964, ± .0010 



Hence Cd = 111.80. 



Secondly, v. Hauer^s experiment? were repeated, cadmium sulphate 

 being reduced to sulphide by heating in a stream of H.S. The following 

 data were obtained : 



Mean, 69.199, ± .0012 

 V. Hauer found, 69.231, ± .0042 



General mean, 69.202, 

 The Partridge series alone gives Cd = 111.718. 



.0012 



1 Amer. Journ. Sci. (3), 4n, 377. 189<1. 



16 



