112 



THE ATOMIC WEIGHTS. 



were as follows, with the percentage of CdS in CdS04 there- 

 from deduced: 



Lenssen* worked upon pure cadmium oxalate, handling, 

 however, only small quantities of material. This salt, upon 

 ignition, leaves the following percentages of oxide : 



.5128 grm. oxalate gave 



.6552 



.4017 



.3281 grm. CdO. 



•4193 



-2573 



63.982 per cent. 



63-996 " 

 64.053 " 



Mean, 64.010, ± .014 



Dumas t dissolved pure cadmium in hydrochloric acid, 

 evaporated the solution to dryness, and fused the residue in 

 hydrochloric acid gas. The cadmium chloride thus ob- 

 tained was dissolved in water and titrated with a solution 

 of silver after the usual manner. From Dumas' weighings 

 I calculate the ratio between CdCL and 100 parts of silver : 



2.369 grm. CdCl.^ — 2.791 giTn. Ag. 84.880 



84.892 

 85.803 

 84.618 

 84.794 

 84.791 



Mean, 84.843, ifc .026 



Latest of all comes Huntington's | work, done under the 

 direction of Professor J. P. Cooke. Bromide of cadmium 



* Journ. fur Prakt. Chem., 79, 281. i860, 

 ■j- Ann. Chem. Pharm., 113, 27. i860. 

 1 Proc. Amer. Acad., 188 1. 



