VV2 



SillTHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



precipitated palladiiiiii was weighed, and in the rinsings from ii the 

 clilorine was determined as silver chloride. The data are siihjoined, with 

 the ratio 2AgCl : Pd(NTI,ri) , : : lOO : ;r in tlie fifth column : 



From the percentage of metal, Pd = 107.32. 

 From the AgCl ratio, Pd = 106.G3. 



Amberg's second series of analyses resemble? the first, except that the 

 palladium was precipitated by hydrazin sulphate. The percentage of 

 metal is given by Amberg, but not the weights actually obtained : 



From percentage of metal, Pd = 106.63. 

 From AgCl ratio, Pd = 106.62. 



The silver chloride ratio combines with previous determinations as 

 follows : 



Bailey and Lamb 73.807, ± .0742 



Amberg, first series 73.818, ± .0677 



Amberg, second series 73.814, ± .0614 



General mean 73.813, ± .0388 



In his third series of analyses Aml)erg deterinined oidy tlie palladium, 

 which was precipitated electrolytically from a sul})liuric acid solution 

 of the palhidiammonium chloride with a rapidly rntating anode. This 



