158 



THE ATOMIC WEIGHTS. 



vacuum standards throughout. First, Leiissen's method was followed, 

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



CdC.,0,. 

 .09898 

 .21548 

 .10711 

 .17948 

 .16066 



17995 

 34227 



.43154 

 53510 

 .41311 



CdO. 

 .70299 

 .77746 

 .70807 

 75440 

 .74327 

 75471 

 .85864 



.91573 

 .98197 

 .80397 



Percent. 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 



Second!} 7 , v. Hauer's experiments were repeated, cadmium sulphate 

 being reduced to sulphide by heating in a stream of H 2 S. The following 

 data were obtained : 



1.60514 



1.55831 

 1.67190 

 1.66976 

 1.40821 

 1.56290 

 1.63278 

 1.58270 



1.53873 

 1.70462 



Mean, 69.199, =h .0012 

 v. Hauer found, 69.231, .0042 



General mean, 69.202, .0012 



In the third set of determinations cadmium oxalate was transformed 

 to sulphide by heating in H 2 S, giving the ratio CdC 2 4 : CdS : : 100 : x. 



1.57092 



1.73654 

 2.19276 



1.24337 

 1.18743 

 1.54038 



1-38905 

 2.03562 

 2.03781 

 1.91840 



CdS. 

 1.13065 

 1.24979 

 1.57825 



.89492 



.85463 

 1.10858 



99974 

 1.46517 

 1.46658 

 1.38075 



Per cent CdS. 

 71.972 

 71.973 

 71-974 

 7L974 

 71-975 

 71.968 

 71.976 

 71.979 

 71.970 

 71.971 



Mean, 71.973, =b .0007 



