INDEX.

Kunz and Baskerville phosphorescence of substance under radium rays, 204
Kunzite phosphorescence of, under radium rays, 203
Laborde and Curie heat emission of radium, 419 origin of heat from radium, 440 radium emanation in waters of hot springs, 514
Langevin coefficient of recombination of ions, 41 velocity of ions, 45 et seq. energy required to produce an ion, 58 secondary radiation produced by X rays, 187 slow moving ions in air, 528
Larmor radiation theory, 77 radiation of energy from moving electron, 79 structure of the atom, 157
Lead, radio-active preparation of, 26 radiations from, 26
Le Bon rays from bodies exposed to sunlight, 5 discharging power of quinine sulphate, 9, 530
Lenard ionization of gases by ultra-violet light, 9 action of ions on a steam jet, 47 penetrating power of cathode rays, 73 negative charge carried by Lenard rays, 120 absorption of cathode rays proportional to density, 136, 137
Lerch, von chemical properties of active deposit of thorium, 313 electrolysis of solution of active deposit, 313 effect of temperature on excited activity, 315 temporary activity of active deposit from thorium, 415
Lockyer inorganic evolution, 499
Lodge, Sir Oliver electronic theory, 69 instability of atoms, 487
Lorentz structure of atoms, 157
Lowry and Armstrong radio-activity and phosphorescence, 444
Luminosity of radium compounds, 205 change of, in radium compounds with time, 205 spectrum of phosphorescent light from radium bromide, 206 of radium compounds unaffected by temperature, 210
Mache radium emanation in hot springs, 513
Mache and von Schweidler velocity of ions in air, 528
Makower diffusion of radium emanation, 274 diffusion of thorium emanation, 276
Marckwald preparation of radio-tellurium, 25 rate of decay of radio-tellurium, 411
Mass apparent mass of electron, 71, 127 variation of mass of electron with speed, 127 et seq. of α particle, 147 et seq.
Materials radio-activity of ordinary, 528, 536 et seq.

549