90 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



The following figures are derived from the analyses, by Richards and 

 Archibald/ of csesiiim bromide : 



Ratio. 



74.076 

 74.082 

 74.084 



Mean, 74.081, ± .0017 



Archibald's ' analyses of rubidium bromide give a similar series of 

 comparisons, as follows : 



Ratio. 



74.114 

 74.075 

 74.076 

 74.081 

 74.075 

 74.069 

 74.070 



Mean, 74.080, ± .0040 



Baxter, Hines and Frevert,^ in order to determine the atomic weight 



Their silver figures are sub- 



Ratio. 



74.081 

 74.075 

 74.084 

 74.088 

 74.088 

 74.083 

 74.086 

 74.086 



Mean, 74.084, ± .0010 



Baxter and Hines ^ also analyzed manganese bromide, and give the 

 following equivalent weights of Ag and AgBr : 



iProc. Amer. Acad., 38, 443. 1903. 

 = Journ. Chem. Soc, 85, 776. 1904. 

 »Journ. Amer. Chem. Soc, 28, 770. 1906. 

 *Joum. Amer. Chem. Soc, 28, 1560. 1906.* 



