INDEX. 



829 



Foote (Dr. P. D.) on ionization and 

 resonance potentials for electrons 

 in vapours of lead and calcium, 

 73 ; on atomic theory and low 

 voltage arcs in caesium vapour, 80. 



Friction, on static, 201. 



cones, on an improved design 



for, 386. 



Frumkin (A.) on the theory of elec- 

 trocapillarity, 363 3 375. 



Gas molecules, on the application of 

 probabilities to the movement of, 

 249. 



Gases, on the ignition of, at reduced 

 pressures by electric sparks, 345 ; 

 on the variation of the specific 

 heat of, with temperature, 357 ; 

 on the relative ionization poten- 

 tials of, 413; on the ignition of, 

 at reduced pressures by transient 

 arcs, 450; on the disappearance 

 of, in the electric discharge, 585 ; 

 on the discharge of "electricity 

 through rarefied, 785. 



Gels, on the cohesion of, 213. 



General Electric Company's Ke- 

 search Staff on the disappearance 

 of gas in the electric discharge, 

 585. 



Geological Society, proceedings of 

 the, 247, 825. 



Gerrard (II.) on electrical disturb- 

 ances due to tides and waves, 149. 



Ghosh (Dr. J. C.) on the absorption 

 of light by the Goldberg wedge, 

 775. 



Giles (Miss I.) on fused copper-mica 

 mixtures, 287. 



Gil in our (A.) on the measurement 

 of changes in resistance bv a valve 

 method, 291. 



Glass, on the thermal conductivitv 

 of, 502. 



Goldberg wedge, on the absorption 

 of light by the, 775. 



Gossling (B. S.) on the ionization 

 potentials of gases as observed in 

 thermionic valves, 413. 



Gravitational fields, on space-time 

 manifolds and. 703. 



Hardy (Prof. W. B.) on static fiic- 



Helium, on the permeability of thin 

 fabrics and films to, 272 ; on the 

 ionization velocity for electrons 

 in, 440: on the ionization of, in 



the sun, 48C ; on the series con- 

 stants of, 489 ; on ionization by 

 election impacts in, 553; on, in 

 the sun, 819. 



Hemsalech (G. A.) on the light 

 radiations emitted by the vapours 

 of magnesium, copper, and man- 

 ganese, 290 ; on a method of 

 focussing the image of a labora- 

 tory light source, 316. 



Hiushelwood (C. N.) on the rate of 

 chemical action in the crystalline 

 state, 569. 



Ilorton (Prof. F.) on the ionization 

 velocity for electrons in helium, 

 440. 



Hot-wire anemometer, on the, 640. 



Hydrogen, on the secondary spec- 

 tiu n of, 159; on the spectra of 

 the positive rays of, 240 ; on the 

 permeability of thin fabrics and 

 films to, 272 ; on the ignition of, 

 by electric sparks, 350 ; on the 

 ionization of, in the sun, 483 ; on 

 the series constants of, 489. 



Ignition of gases at reduced pres- 

 sures by electric sparks, on the, 

 345 ; on the, by transient arcs, 450. 



Inductance formulas, on the use of 

 vector methods in, 793. 



Insulators, on the thermal conduc- 

 tivity of some, 502. 



Iodine vapour, on the dissociation of, 

 and its fluorescence, 189. 



Ionization by collision, on, 129, 505 ; 

 in the solar chromosphere, on, 

 472 ; by electron impacts in helium, 

 on, 553. 



potentials for electrons in lead 



and calcium, on, 73; of gases, on 

 the, 413. 



velocity for electrons in helium, 



on the, 440. 



Jackson (L. C.) on variably coupled 

 vibrations, 329. 



James (P. W.) on the crystalline 

 structure of antimony, 233. 



Jeffery (G. 13.) on the path of a ray 

 of light in the gravitation field of 

 the sun, 327. 



Jevons (W.) on electrical disturb- 

 ances due to tides and waves, 149. 



Johnstone (J. II. L.) on the relative 

 activity of radium and uranium, 

 50. 



Joly (Prof. J.) on the closure of 

 small cavities in rocks, 681. 



