IKDE X. 



'S3 



Self-induction-!, on the comparison 

 of two, 608. 



Sharpe (Dr. F. R.) on a problem in 

 age-distribution, 435. 



Snioluchowski (Prof. JYI. S.) on the 

 conduction of heat through rare- 

 fied gases, 11. 



Snow (E. C.) on restricted lines and 

 planes of closest fit to systems of 

 points, 367. 



Soddy (F.) on the y-rays of thorium 

 and actinium, 130 ; on the ratio 

 between uranium and radium in 

 minerals, 652. 



Spectra, on the resonance, of iodine, 

 261. 



Spectrum, on the transformation of 

 a resonance into a band, by pre- 

 sence of helium, 265 ; on a method 

 of measuring the luminosity of 

 the, 604. 



Sphere, on the bending of electric 

 waves round a large, 62, 281 ; on 

 the uniform motion of a, through 

 a viscous fluid, 112 ; on the damp- 

 ing of the vibrations of a dielec- 

 tric, 438 ; on the initial accele- 

 rated motion of an electrified, 

 640. 



Spherical surfaces, on a revolving 

 table method of determining the 

 curvature of, 218. 



Stead (G. ) on the problem of uni- 

 form rotation treated on the prin- 

 ciple of relativity, 319. 



Stephenson (A.) on the maintenance 

 of periodic motion by solid fric- 

 tion, 161 ; on a peculiar property 

 of the asymmetric system, 166 ; 

 on water waves as asymmetric 

 oscillations and on the stability of 

 free wave-trains, 773. 



Steven (A. I.) on an apparent soft- 

 ening of Rontgen rays in trans- 

 mission through matter, 659. 



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

 blem of the uniform rotation of a 

 circular cylinder in connexion with 

 the principle of relativity, 342 ; 

 on the longitudinal and transverse 

 mass of an electron, 733. 



Taylor (T. S.) on the ionization of 

 different gases by the alpha parti- 

 cles from polonium and the relative 

 amounts of energy required to 

 produce an ion, 571. 



Temperature, density, and pressure 

 of substances, relations between 

 the, 325 ; on the effect of, on the 

 absorption coefficient of iron for 

 y rays, 532. 



Thomson (Sir J. J.) on rays of posi- 

 tive electricity, 225. 



Thorium, on the y-rays of, 130. 



Thornton (Prof. W. M.) on thunder- 

 bolts, 630. 



Thunderbolts, on, 630. 



Tide races, on, 187. 



Tolman (Dr. R. C.) on the derivation 

 from the principle of relativity of 

 the fifth fundamental equations 

 of the Maxwell-Lorentz theory, 

 296. 



Tubes, on a method of calibrating 

 line capillary, 386. 



Tyndall (A. M.) on the value of the 

 pitot constant, 348 ; on the dis- 

 charge from an electrified point, 

 585. _ 



Ultra-violet light from the mercury 

 arc, on the, 393. 



Uranium and radium, on the ratio 

 between, in minerals, 652. 



Valency, on the question of, in 

 gaseous ionization, 753. 



Vapours, on homogeneous Rontgen 

 radiation from, 446. 



Vibration curves, photographs of, 

 615. 



Vibrations, of a circular membrane, 

 on Bessel's functions as applied to 

 the, 53 ; on the damping of the, 

 of a dielectric sphere, 438. 



Viscosity and atomic weight, on the 

 relation between, for the inert 

 gases, 45. 



Viscous fluid, on the uniform motion 

 of a sphere through a, 112 ; on 

 steady motion in a corner of a, 191 . 



liquid, on the motion of solid 



bodies through, 697. 



medium, on an approximate 



theory of an elastic string vibra- 

 ting in a, 742. 



Water waves as asymmetric oscil- 

 lations, on, 773. 



Waves, on the bending of electric, 

 round a large sphere, 62, 281 ; on 

 the motion of, into shallower water, 

 178; on periodic, in deep water, 

 183; on water, as asymmetric 

 oscillations, 773. 



S 



