velocity acquired by, between collisions, 58
energy required to produce, 58, 551
comparative number of, produced in gases, 65
disturbance of potential gradient by movement of, 65
production of, in insulators, 209
number of, produced by α particle, 433
number produced per c.c. in closed vessels, 533 et seq.
Joly
motion of radium in an electric field, 211
absorption of radium rays by atmosphere, 492 (see foot-note)
Kaufmann
velocity of cathode rays, 75
variation of e/m with velocity of electron, 127 et seq.
Kelvin
theory of radio-activity, 441
age of sun and earth, 492, 493
Kelvin, Smolan and Beattie
discharging power of uranium rays, 7
Kleeman and Bragg
theory of absorption of α rays, 172 et seq. relation between ionization and absorption, 174 et seq. range of α rays in air, 174 four sets of α rays from radium, 174 et seq.
Kohlrausch
conductivity of water altered by radium rays, 208
Kohlrausch and Henning
conductivity of solutions of radium bromide, 208
Kunz
phosphorescence of willemite and kunzite, 203
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
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