444 



SMITHSONIAN MISCELLxVNEODS COLLECTIONS 



VOL 54 



2.84891 

 2.29593 

 1.89033 



101.412 

 101.414 

 101.413 



Mean, 101.407, 

 ± .0018 



58.255 

 58.253 

 58.259 



58.255, 

 ± .0007 



The two series for the AgBr ratio, combined, give a weighted mean of 

 58.2549, ±.0007. 



From Ag ratio, Co = 58.957. 

 From AgBr ratio, Co = 58.966. 

 And Ag : Br : : 100 : 74.075. 



In their second memoir Eichards and Baxter describe the reduction 

 of cobalt bromide by heating in hydrogen. Three series of erperiments 

 were made, and in two of them a correction was necessary for small 

 quantities of sodium bromide contained in the cobalt salt. In the fol- 

 lowing tables, the corrected weights of cobalt bromide and cobalt are 

 given : 



Series I. 

 CoBr^. Co. Percent. Co. 



5.59023 1.50680 26.954 



4.61518 1.24381 26.950 



3.74498 1.00920 26.948 



3.00135 .80899 26.954 



Mean, 2G.953, ± .0021 



The general mean of the three series is 26. 9508, ±.0008. Hence Co: 

 58.971. 



