CADMIUM. 159 



This work of Partridge was presently discussed by Clarke,* with ref- 

 erence to the concordance of the data, and it was shown that the three 

 ratios determined could be discussed algebraically, giving values for the 

 atomic weights of Cd, S, and C, when = 16. These values are 



Cd= 111.7850 

 C = 11.9958 

 S = 32.0002, 



and are independent of all antecedent values except that assumed for 

 the standard, oxygen. 



Morse and Jones, f starting out from cadmium purified by fractional 

 distillation in vacuo, adopted two methods for their determinations. 

 First, they effected the synthesis of the oxide from known weights of 

 metal by dissolving the latter in nitric acid, evaporating to dryness, and 

 subsequent ignition of the product. The oxide thus obtained was found 

 to be completely free from oxides of nitrogen. The weighings,-which are 

 given below, were made in tared crucibles. The third column gives the 

 percentage of Cd in CdO. 



Cd Taken, CdO Found. Per cent. Cd. 



.77891 2.03288 87.507 



.82492 2.08544 87.508 



.74688 1.99626 87.507 



.57000 1.79418 87.505 



.481 2.26820 87.506 



.27297 2.59751 87.504 



.75695 2.00775 87.508 



.70028 1.94305 87.505 



.92237 2.19679 87.508 



.92081 2.19502 87.508 



Mean, 87.5066, rb .00032 



The second method employed by Morse and Jones was that of Lenssen 

 with cadmium oxalate. This salt they find to be somewhat hygroscopic, 

 a property against which the operator must be on his guard. The data 

 found are as follows : 



CdC 2 O t . CdO. Percent. CdO.' 



53937 .98526 64.004 



.77483 1.13582 63996 



.70211 1.08949 64.008 



.70238 1.08967 64.004 



.74447 1.11651 64.003 



Mean, 64.003, .0042 



Lorimer and Smith, like Morse and Jones, determined the atomic 

 weight of cadmium by means of the oxide, but by analysis instead of 



*Am. Chem. Jourii., 13, 34. 1891. 

 t Am. Chem. Journ., 14, 261. 1892. 



