PART I. AUTHOR-INDEX. 135 



Ramsay, W. The gases of the atmosphere, the history of their dis- 

 covery. London: Macmillan, 1896, 240 pp., with portraits. 



. Helium, a gaseous constituent of certain minerals. Proc. 



• Roy. Soc. 59 (1896) 325-330. 

 and J. N. Collie. Helium and Argon. Experiments which 



show the inactivity of these elements. Proc. Roy. Soc. 60 (1896) 



53-56. 



, . Homogeneity of Argon and of Helium. Nature 54 



(1896) 406-407; C.-R. 123 (1896) 214-216; Proc. Roy. Soc. 60 



(1896) 206—216. 



and M. W. Travers. The gaseous constituents of certain 



mineral substances and natural waters. Proc. Roy. Soc. 60 



(1897) 442-448. 



, . The refractivity of certain mixtures of gases. Rept. 



Brit. Assoc. (1897) 587-588. 

 , . On the refractivities of Air, Oxygen, Nitrogen, Argon, 



Hydrogen, and Helium. Proc. Roy. Soc. 62 (1898) 225-232; 



Beibl. (1898) 217. 

 , . The homogeneity of Helium. Proc. Roy. Soc. 62 (1898) 



316-324; Beibl. (1898) 267. 

 — — , — — . Fergusonite, an endo thermic mineral. Proc. Roy. Soc. 



62 (1898) 325-329; Beibl. (1898) 266. 



, . A new constituent of atmospheric air. Proc. Roy. Soc. 



63 (1898) 405-408; C.-R. 126 (1898) 1610-1613, 1762-1763; 

 Beibl. (1898) 513; Nuov. Cim. 7 (1898) 390-393. (Metargon and 

 Krypton.) 



, . The extraction of the companions of Argon and of Neon. 



Chem. News 78 (1898) 154-155. 

 , . Note on new gases in the Earth's atmosphere; Krypton, 



Neon, Metargon. Proc. Roy. Soc. June 3, 1898; Astrophys. J. 



8 (1898) 120—122. 

 , and E. C. Baily. The Spectrum of Metargon. Nature 58 



(1898) 245-246; Beibl. (1898) 772. 



, . On the companions of Argon. Proc. Roy. Soc. 63 (1898) 



437-440; Naturw. Rundsch. 13 (1898) 349-350; Beibl. (1898) 513. 



, . The preparation and some of the properties of pure 



Argon. Chem. News 79 (1899) 49-50. 



. Note on the densities of Atmospheric Nitrogen, Pure Nitro- 

 gen, and Argon. Proc. Roy. Soc. 64 (1899) 181-183. 



Rancken, E. Untersuchung liber das Linienspektrum des Schwefels. 

 Diss. Helsingfors 1897, 52 pp.; Beibl. (1899) 97. 



