INDEX. 



847 



excited by gamma rays, 281 ; on 

 the number of ions produced by 

 the beta and gamma radiations 

 from radium, 327 ; on the mass 

 and velocities of the alpha particles 

 from radioactive substances, 552. 



Rocks of the Kolar goldfields, on the 

 radioactivity of the, 44. 



Riintgen radiation, on the production 

 of soft, by the impact of positive 

 and slow cathode rays, 620. 



Kotating fluid, figures of equilibrium 

 of a, 671. 



Rotation-energy of molecules, on 

 the quantum-theory and the, 71. 



liotational optical activity, on the 

 theories of, 302, 756. 



Rutherford (Sir E.) on the spec- 

 trum of the penetrating gamma 

 rays from radium B and radium 0, 

 263 ; on the spectrum of the 

 beta rays excited by gamma 

 rays, 281 ; on the connexion be- 

 tween the beta and gamma 

 ray spectra, 305 ; radium con- 

 stants on the International stan- 

 dard, 320 ; on the mass and 

 velocities of the alpha particles 

 from radioactive substances, 552. 



Rydberg (Prof. J. R.) on the ordinals 

 of the elements and the high- 

 frequency spectra, 144. 



Sckwatt (Dr. I. J.), note on a definite 

 integral, 57. 



Scrivenor (J. B.) on the topaz- 

 bearing rocks of Gunong Bakau, 

 160. 



Selenium, on the seat of light-action 

 in crystals of, 497. 



Shakespear (JJr. G. A.) on the re- 

 sistance of the air to falling 

 spheres, 728. 



Sheard (J)r. 0.) on the positive ion- 

 ization from heated platinum, 

 170. 



Sieg (Dr. L. P.) on the seat of light- 

 action in crystals of metallic 

 selenium, 407. 



Spectra, on the, of carbon and its 

 compounds, 117 ; on high-fre- 

 quency, and the periodic table, 

 139 ; on the ordinals of the 

 elements and the high-frequency, 

 144 ; on the connexion between 

 the beta and gamma ray, 305 ; 

 on the high-frequency, of the 

 elements, 787. 



Spectrum, on the, of helium, 90 ; 

 on the, of the penetrating gamma 

 rays from radium B and radium C, 

 263 ; on the X-ray, of nickel, 274 ; 

 on the magnetic, of the beta rays 

 excited in metals by soft X rays, 

 277 ; on the, of the beta rays ex- 

 cited b} r gamma rays, 281 ; on the 

 absorption, of zinc vapour, 360. 



Sphere, on the forces acting on a 

 solid, in contact with a liquid 

 surface, 149 ; on the resistance of 

 the air to a falling, 728. 



Steels, on permanent magnetism of 

 chrome and tungsten, 738. 



Stevens (Dr. H. 0.) on visual sen- 

 sations caused by a magnetic field, 

 188. 



Stewart (J. G.) on the inapplica- 

 bility of Boltzmann's equipartition 

 hypothesis to gases in a state of 

 change of internal energy, 748. 



String galvanometer, on the theory 

 of Einthoven's, 207. 



Strips, on the bifilar properties of 

 twisted, 778. 



Surface-tensions of liquids in con- 

 tact with gases, on the, 403. 



Sutton (T. C.) on the mechanism of 

 molecular action, 798. 



Swan spectrum, on the, 117. 



Swann (Dr. W. F. G.) on the elec- 

 trical resistance of thin metallic 

 films, 467. 



Szmidt (Miss J.) on the distribution 

 of energy in the different types 

 of gamnra rays from radioactive 

 substances, 527. 



Thomson (Sir J. J.) on the pro- 

 duction of soft Rontgen radiation 

 by the impact of positive and slow 

 cathode rays, 620. 



'thorium, on lead and the end pro- 

 duct of, 823. 



D, on the volatility of, 808. 



Thornton (Prof. W. M.) on the 

 lost pressure in gaseous explosions, 

 18 ; on the least energy required 

 to start a gaseous explosion, 734. 



Tolnran (Prof. R. 0.) on the theory 

 of relativity, 572, 583. 



Tomkins (J. A.) on the slip-curves 

 of an Amsler planimeter, 142. 



Townsend (Prof. J. S.) on the po- 

 tentials required to maintain 

 currents between coaxial cvlinder^, 

 S3. 



