ATOMIC WEIGHTS 



455 



64.708 

 64.9G5 

 64.781 



Mean, 64.818 



From this mean, Pel = 112.05. Tins result has no present value. 



In 1889 Keiser's first determinations of this constant appeared.^ Find- 

 ing the potassium palladiochloride to contain "water of decrepitation/' 

 he abandoned its use and resorted to palladiammonium chloride, 

 Pd(]SrH3Cl)o, as the most available compound for his purpose. This 

 salt, heated in hydrogen, yields spongy palladium, which was allowed 

 to cool in a current of dry air, in order to avoid gaseous occlusions. The 

 salt itself Avas dried, previous to analysis, first over sulphuric acid, and 

 then in an air bath at a temperature from 120° to 130°. Two series of 

 experiments were made, the second series starting out from palladium 

 produced by the first series. The data are as follows : 



Mean, 50.379, 



.0008 



Eeduced to vacuum this becomes 50.360. 

 Hence Pd = 106.51. 



Am. Chem. Journ.. 11, 398. 1889. 



