540 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. S-t 



The densities of the three other inert gases were iirst determined by 

 Eamsa}^ and Travers/ Referred to = 16, the figures become 



Ne 9.99 9.94 



Kr 40.88 40.78 



Xe G4.00 63.64 



They also assign to argon the densities 19.93 and 19.96. 



Ladenburg and Krligel/ in their determinations of the density of kryp- 

 ton, obtained erroneons values, namely, 29.335 and 29.405. Ramsay,' 

 in still later experiments, found for Ivr the densities 40.81, 40.82 and 

 40.73, in agreement with the figures given by Ramsay and Travers. 



More conclusive data for krypton and xenon are given by Moore," 

 who worked with residues separated by fractionation from 120 tons of 

 liquid air. For krypton the densities found were 41.504 and 41.509, 

 or 41.506 in mean. For xenon Moore found the densities 65.380 and 

 65.328, in mean, 65.354. 



Since these gases are all monatomic, their atomic weights are double 

 their densities as given in the foregoing paragraphs. They are then to 

 be taken as follows : 



Moore's figures are preferred for kry])ton and xenon, and Berthelot's 

 for argon. 



1 Proc. Roy. Soc, 67, 329. Phil. Trans., 197A, 47. 1900. 



- Chem. News, 81, 205. From Sitzungsb. Berlin. Akad., 19m, 212. 



»Proc. Roy. Soc, 71, 421. 1903. 



*Journ. Chem. Soc, 93. 2181. V.mH. 



