'80 



INDEX. 



Friction, on the maintenance of 



periodic motion by solid, 161. 

 Fry (J. D.) on the value of the pitot 

 constant, 848. 



Gamma rays from Ra C in the earth, 

 on, 29 ; on the, of thorium and 

 actinium, 130; on the effect of 

 temperature on the absorption 

 coefficient of iron for, 532. 



Gaseous ionization, on the question 

 of valency in, 753. 



Gases, on the conduction of heat 

 through rarefied, 11 ; on the rela- 

 tion between viscosity and atomic 

 weight for the inert, 45 ; on some 

 constants of the inert, 69 ; on the 

 potentials required to produce dis- 

 charge in, 479; on the ionization 

 of different, by the alpha particles 

 of polonium, 571. 



Geological Societv, proceedings of 

 the, 173, 279, 392, 695. 



Granite, on the radioactivity of the 

 Leinster, 102. 



Grating, on interferometry with the 

 aid of a, 411. 



Gray (T)r. J. G.) on magnetic 

 testing, 1. 



Griffith (0. W.) on the measurement 

 of the refractive index of liquids, 

 301. 



Hamilton's equations and the par- 

 tition of energy between matter 

 and radiation, on, 15. 



Hatch (Dr. F. H.) on dedolomiti- 

 zation in the marble of Port Shep- 

 stone, 173. 



Heat, on the conduction of, through 

 rarefied gases, 11 ; on the, libe- 

 rated during the absorption of 

 electrons, 404 ; on the, of mixture 

 of substances and the relative dis- 

 tribution of molecules in the 

 mixture, 535. 



Heat-waves, on the focal isolation 

 of long, 249. 



Helium, on the transformation of a 

 resonance spectrum into a band- 

 spectrum by presence of, 265. 



Horwood (A. R.) on the origin of 

 the British Trias, 392. 



Houstoun (Dr. R. A.) on magneto- 

 striction, 78. 



Hughes (A. LI.) on the ultra-violet 

 light from the mercury arc, 393. 



Hydrodynamical notes, 177. 



Hvdrogen, on the electric discharge 



in, 598. 

 Inductor, on a new form of earth, 



579. 

 Insects, on metallic colouring in, 554. 

 Interferometry with the aid of a 



grating, on, 411. 

 Iodine, on the resonance spectra of, 

 261 ; on the influence of other 

 gases upon the fluorescence of, 

 809, 314 ; on condensation nuclei 

 produced by the action of light 

 on vapour of, 465. 

 Ionization, on the, of the atmo- 

 sphere due to radioactive matter, 

 26 ; on a method of determining 

 capacities in measurements of, 42 ; 

 on the, of different gases by the 

 alpha particles of polonium, 571 ; 

 on the question of valency in 

 gaseous, 753. 

 Ions, on the energy required to pro- 

 duce, 571 ; on the velocity of the, 

 ol alkali salt vapours in flames, 

 711. 

 Iron, on the effect of temperature on 

 the absorption coefficient of, for 

 y rays, 532. 

 Iron wires, on the change of resistance 

 of, in strong magnetic fields, 122. 

 Ives (Prof. J. E.) on a new form 

 of earth inductor, 579 ; on an 

 approximate theory of an elastic 

 string vibrating in a viscous 

 medium, 742. 

 Jordan (F. W.) on the direct mea- 

 surement of the Peltier erl'ect, 454, 

 Kleeman (Dr. R. D.) on the law of 

 chemical attraction between atoms, 

 83 ; on relations between the den- 

 sity, temperature, and pressure of 

 substances, 325 ; on the heat of 

 mixture of substances and the 

 relative distribution of molecules 

 in the mixture, 535. 

 Lamb (Prof. H.) on the uniform 

 motion of a sphere through a 

 viscous fluid, 112. 

 Lamp-black, on the reflective power 



of, 167. 

 Light, on the ultra-violet, from the 

 mercury arc, 393 ; on condensation 

 produced by the action of, on 

 iodine vapour, 465 ; on apparatus 

 for the production of circularly 

 polarized, 517. 



