INDEX.

Gases evolved by radium, 215 presence of helium in gases from radium, 216
Gates, Miss F. effect of temperature on excited activity, 315 discharge of quinine sulphate, 530
Geitel natural conductivity of air in closed vessels, 501, 531
Geitel and Elster radio-active lead, 27 effect of magnetic field on conductivity produced by radium rays, 113 scintillations produced by active substances, 158 action of radium rays on spark, 208 photo-electric action of bodies coloured by radium rays, 214 radio-active matter in earth, 494 discovery of radio-active matter in atmosphere, 501 emanations from the earth, 507 radio-activity of air in caves, 507 radio-activity of the soil, 515 radio-activity of fango, 516 variation of radio-activity of air with meteorological conditions, 517 effect of temperature and pressure on radio-activity in atmosphere, 518
Giesel coloration of bunsen flame by radium, 15 separation of radium by crystallization of bromide, 15 emanating substance, 21 radio-active lead, 27 magnetic deviation of β rays, 113 decrease with time of luminosity of radio-active screen, 205 spectrum of phosphorescent light of emanium due to didymium, 206, 207 coloration of bodies by radium rays, 213 evolution of gases from radium, 215 action of radium rays on the eye, 217 emanation from the emanating substance, 250 luminosity produced by radium emanation, 251 decay of excited activity of emanium, 312 activity of radium dependent on age, 371 bismuth made active by radio-active solution, 417 temperature of radium bromide above air, 420
Gimingham and Rossignol decay of thorium emanation, 242
Glass coloration produced in, by radium rays, 213 phosphorescence produced in, by emanation, 252
Glew simple form of spinthariscope, and scintillations, 159
Globulin action of radium rays on, 214
Godlewski effect of crystallization on activity of uranium, 349 diffusion of uranium X, 350 separation of actinium X, 365 source of actinium emanation, 365 recovery and decay curves of actinium, 366 penetrating power of β and γ rays from actinium, 368 radiations from active products, 368

546