832 



INDEX. 



Spectral emission, on Rydberg's law 

 and the quantum theory of, 619. 



Spectrum of caesium vapour, on the, 

 80; on the secondary, of hydro- 

 gen, 159 ; on the, of hydrogen 

 positive rays, 240. 



Static friction, on, 201. 



Stead (G.) on the ionization po- 

 tentials of gases as observed in 

 thermionic valves, 413. 



Stenz (E.) on the dissociation of 

 iodine vapour and its fluorescence, 

 189. 



Stewart (R. M.) on the adjustment 

 of observations, 217. 



Stimson (Dr. H. F.) on ionization 

 and resonance potentials for elec- 

 trons in vapours of lead and 

 calcium, 73. 



Sulphur, on the mass-spectrum of, 

 631. 



Sun, on the path of a ray of light in 

 the gravitation field of the, 327 ; 

 on elements in the, 809. 



Thermal conductivity of some solid 

 insulators, on the, 502; on the 

 variation of, during the fusion of 

 metals, 542. 



Thermionic valve, on the ionization 

 potentials of gases as observed in 

 the, 413 ; on an application of the, 

 to the measurement of small dis- 

 tances, 634. 



Thomas (J. S. G.) on the directional 

 hot-wire anemometer, 640. 



Thomson (G. P.) on the spectrum of 

 hydrogen positive rays, 240. 



Thomson (Sir J. J.) on the scattering 

 of light by unsym metrical atoms 

 and molecules, 393 ; on optical 

 effects due to scattering of light by 

 electrons, 713. 



Thornton (Prof. W. M.) on the ig- 

 nition of gases at reduced pressures, 

 345, 450. 

 Tides, on electrical disturbances due 



to, 149. 

 Time, on the measurement of, 161. 

 Tobin (T. O.) on a method of finding 

 a parabolic equation of the ;-th 

 degree for any graphically faired 

 curve, 513. 



Todd (Prof. G. W.) on the variation 

 of the specific heat of a gas with 

 temperature, 357. 



Torsion of closed and open tubes, on 

 the, 521. 



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

 lisions of electrons with molecules 

 of a gas, 505. 



Toy (F. O.) on the absorption of light 

 by the Goldberg wedge, 775. 



Tubes, on the torsion of closed and 

 open, 521 . 



Tunstall (J.) on the crystalline 

 structure of antimony, 233. 



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

 on the poles of an electric arc, 

 780. 



Ultra-micrometer, on the, 634. 



Uni molecular reactions, on the ve- 

 locity of, 461. 



Uranium, on the relative activity of 

 radium and, 50. 



Vapour pressure equation, on a, 362. 



Vapours, on the specific heat of 

 saturated, 211, 501. 



Vector methods, on the use of, in 

 inductance and capacity formulas, 

 793. 



Velocities, on Einstein's law for 

 addition of, 771. 



Vibrations, on variably coupled, 329. 



Vortices, on the stability of, 138. 



Waller (Miss M. D.) on the alter- 

 nating-current arc, 781. 



W. tran (H. P.) on an improved design 

 for friction cones, 386. 



Waves, on stationary, in water, 97; 

 on electrical disturbances due to, 

 149. 



Whidding'ton (Prof, li.) on the ultra- 

 micromeier, 634. 



Williams (A. L.) on the electrical 

 conductivity of copper fused with 

 mica, 281. 



Wi.son( W.) on space-time manifolds 

 and gravitational fields, 703. 



Wireless telegraphy, on the current 

 generated in a receiving antenna 

 for, 163. 



Young (Dr. F. 13.) on electrical dis- 

 turbances due to tides and waves, 

 149. 



UND OF THE FORTIETH VOLUME. 



Printed by Taylor and Fhancis, Ked Lion Court, Fleet Street. 



