530 



INDEX. 



Collodion films, on the colours dif- 

 fusely reflected from, spread on 

 metal surfaces, 423. 



Coloured flames of high luminosity, 

 on the production of, 243. 



Combustion of organic compounds, 

 on the nature of chemical affinity 

 in the, 66. 



Convection currents, on periodic, in 

 the atmosphere, 112, 449. 



Coolidge tube, on the penetrating 

 power of the X radiation from a, 

 153. 



Correlation coefficient, on the varia- 

 tion of the multiple, 205. 



Coupled vibrations, on, 246, 510. 



Currents, on high-potential batteries 

 for supplying small, 327. 



Dey (A.) on the maintenance of 

 vibrations by a periodic field of 

 force, 129. 



Diffusion, on the partial separation 

 by thermal, of gases of equal 

 molecular weight, 146. 



Dixey (F.) on the carboniferous 

 limestone series of the South 

 Wales coalfield, 382. 



e, N, and related constants, on a new 

 determination of, 1. 



Eddington (Prof. A. S.) on astro- 

 nomical consequences of the elec- 

 trical theory of matter, 163, 

 321. 



Electrical conductivity of mica, on 

 the temperature variation of the, 

 195. 



field, on the distribution of the 



active deposit of radium in an, 

 429. 



theory of matter, on astro- 

 nomical consequences of the, 81, 

 163, 321, 517 ; on some funda- 

 mental concepts of the, 405. 



Electrodynamic field, on the flux of 

 energy in the, 385. 



Electromagnetic field, on the energy 

 in the, 142. 



Electronic charge of a gram-mole- 

 cule, on a new determination of 

 the, 1. 



frequency and atomic number, 



on, 488. 



Electrons, on the motion of, through 

 gases, 33. 



Energy, on the flux of, in the 

 electrodynamic field, 385 ; in the 

 electromagnetic field, 142. 



Evaporation from a circular water 

 surface, on, 308. 



Ferguson (Dr. A.) on evaporation 

 from a circular water surface, 

 308. 



Field of force, on the maintenance 

 of vibrations by a periodic, 129. 



Flames, on the production of col- 

 oured, of high luminosity, 243. 



Flicker photometer speed, on hue 

 difference and, 99. 



Focometry of lens-combinations, on 

 the, 76. 



Garwood (Dr. E. J.) on the geology 

 of the Old Eadnor district, 528. 



Gas atoms, on the frequency of the 

 shortest vibrations emitted by, 

 285. 



Gases, on the motion of ions and 

 electrons through, 33 ; on the 

 partial separation of thermal dif- 

 fusion of, 146. 



Geological Society, proceedings of 

 the, 151, 382, 4«0, 528. 



Goodyear (Miss E.) on the geology 

 of the Old Radnor district, 

 528. 



Harker (Dr. A.) on igneous action 

 in Britain, 151. 



Helium, on the limiting frequency 

 in the spectrum of, in the extreme 

 ultra-violet, 285. 



Hemsalech (G. A.) on the origin of 

 the line spectrum emitted by iron 

 vapour in the explosion region of 

 the air-coal gas flame, 221 ; on the 

 production of coloured flames of 

 high luminosity, 243. 



Horton (Prof. F.) on high potential 

 batteries for supplying small cur- 

 rents, 327 ; on the application of 

 thermionic currents to the theory 

 of ionization by collision, 461. 



Hue difference and flicker photo- 

 meter speed, on, 99. 



Hydrogen, on the limiting frequency 

 in the spectrum of, in the extreme 

 ultra-violet, 285. 



Inertia, on electrical high-speed, 81, 

 163, 321. 



Ionization by collision, on the ap- 

 plication of thermionic currents to 

 the study of, 461. 



Ionizing potential of sodium vapour, 

 on the, 176. 



Ions, on the motiod of, through 

 gases, 33. 



