158 



THE ATOMIC WEIGHTS. 



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



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



CdCfi^. CdO. Percent. CdO. 



1.09898 .70299 63.966 



1. 21548 .77746 63.962 



1.10711 .70807 63.957 



1. 17948 .75440 63.959 



1. 16066 -74327 63.959 



1. 17995 -75471 63.964 



1.34227 .85864 63.96S 



1-43154 • -91573 63.970 



1. 53510 -98197 63.968 



1.41311 _ .90397 63.971 



Mean, 63.964, ih .0010 



Secondl}^, v. Hauer's experiments were repeated, cadmium sulphate 

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

 data were obtained : 



CdSO,. 

 1. 60514 



1-55831 

 I. 67190 

 1.66976 

 1.4082 1 

 1.56290 

 1.63278 

 1.58270 



1-53873 

 1.70462 



General mean, 69.202, zh .0012 



In the third set of determinations cadmium oxalate was transformed 

 to sulphide by heating in H^S, giving the ratio CdC.O^ : CdS : : lUO: x. 



CdQO^. 

 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 



-85463 

 1. 10858 



-99974 

 I -465 17 

 1.46658 



1-38075 



Per cent CdS. 

 71.972 

 71-973 

 71974 

 71-974 

 71-975 

 71.968 

 71.976 



71-979 

 71.970 



71.971 



Mean, 71.973, ± .0007 



