

824 



INDEX. 



Thorium, on the velocities of the 

 alpha particles from, 702. 



Thornton (Prof. W. M.) on the 

 electric strength of solid dielec- 

 trics, 124 ; on the total radiation 

 from a gaseous explosion, 383. 



Treleaven (C. L.) on residual ioni- 

 zation in gases, 415. 



Tungsten, on the high-frequency 

 spectrum of, 368. 



Tyndall (Dr. A. M.) on the critical 

 field at a discharging point, 637 ; 

 on ionic mobilities in hydrogen, 

 743. 



Ultra-Schumann rays, on the fluores- 

 cence produced by, 449. 



Ultraviolet spectrum of elementary 

 silicon, on the. 482. 



Uranium, on the relation between, 

 and radium, 209. 



Van der Waals' equation of state, on 

 the application of, to magnetism, 

 711. 



Vibrating dynamical system, on a 

 method of finding the periods 

 and coefficients of damping of a, 

 780. 



Vint (J.) on the paths of the par- 

 ticles in the motion of frictionless 

 fluid in a rotating enclosure, 284. 



Viscous incompressible fluid, on the 

 stability of the simple shearing 

 motion of a, 329. 



Vision, on intermittent, 701. 



Weatherburn (C. E.) on problems in 

 electrostatics and the steady flow 



of electricity under the expo- 

 nential e-'fo/r, 568. 



Wilson (E. D.) on energy relations 

 involved in the formation of com- 

 plex atoms, 723. 



Wilton (Dr. J. R.) on the solution 

 of certain problems of two-dimen- 

 sional physics, 761. 



Winds, on the theory of the, 13. 



Wood (A. B.) on the velocities of 

 the alpha particles from thorium 

 active deposit, 702 ; on the recoil 

 of radium D from radium C, 811. 



Wood (Prof. R. W.) on an experi- 

 mental determination of the law 

 of reflexion of gas molecules, 300 ; 

 on the effect of electric and mag- 

 netic fields on the emission lines of 

 solids, 316 ; on the fluorescence 

 produced by ultra-Schumann ravs, 

 449. 



X rays, on the maximum frequency 

 of the, from a Coolidge tube, 339 "; 

 on the efficiency of production of, 

 from a Coolidge tube, 361; on 

 the ionization of hydrogen by, 

 644 ; on the velocities of electrons 

 expelled by, 745. 



Young's modulus, on the tempe- 

 rature coefficient of, for electri- 

 cally heated iron wire, 373. 

 Zeleny electroscope, on the, 381. 

 Zinc, on the delta radiation emitted 

 by, when bombarded by alpha 

 rays, 491 ; on the absorption 

 spectrum of the vapour of, 695. 



END OF THE THIRTIETH VOLUME. 



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