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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 54 



Similar data are furnished by Ebangh's ^ analyses of silver arsenate, 

 which were designed to determine the atomic weight of arsenic. .The 

 weights are all reduced to a vacuum standard. 



.0050 



In their memoir upon the atomic weight of caesium, Richards and 

 Archibald ' give analyses of cesium and potassium chloride, balancing 

 each salt against silver and silver chloride. In the following table the 

 first two determinations are derived from the potassium salt, and the 

 others from the caesium compound. The weights refer to the vacuum 

 standard, as do all the others in this group of determinations. 



.0024 



Figures of the same order are given by Archibald in his research upon 

 the atomic weight of rubidium,* and again in his memoir upon potassium.' 



^ Doctoral thesis. University of Pennsylvania, 1901. 



2 Proc. Amer. Acad., 38, 443. 1003. 



sjourn. Chem. Soc, 85, 786. 1904. 



••Trans. Roy. Soc, Canada, 1904, Sec. Ill, p. 47. 



