INDEX.

Goldstein canal rays, 78 coloration of bodies by radium rays, 213
Gonder, Hofmann, and Wölfl properties of radio-active lead, 27, 413
Grier and Rutherford magnetic deviation of β rays of thorium, 114 relative current due to α and β rays, 195 nature of rays from Ur X, 347
Hardy coagulation of globulin by radium rays, 214
Hardy and Miss Willcock coloration of iodoform solutions by radium rays, 214
Hardy and Anderson action of radium rays on the eye, 217
Harms number of ions per c.c. in closed vessel, 534
Hartmann spectrum of phosphorescent light of emanium, 206
Haschek and Exner spectrum of radium, 17
Heat rate of emission of, from radium, 419 et seq. emission of, from radium at low temperatures, 420 connection of heat emission with the radio-activity, 421 et seq. source of heat energy, 421 et seq. rate of emission of, after removal of the emanation, 422 et seq. rate of emission of, by emanation, 423, 431 variation with time of heat emission of radium, and of its emanation, 423 heating effect of the emanation, 423, 431 heating effect of active deposit, 425 proportion of heating effect due to radio-active products, 433 origin of, in radium, 442 et seq. total heat emission during life of radio-elements, 474 et seq. heating of earth by radio-active matter, 493
Heaviside apparent mass of moving charged body, 71, 127
Helium produced by radium and its emanation, 476 et seq. amount of, from radium, 480 origin of, 480
Helmholtz and Richarz action of ions on steam jet, 47
Hemptinne action of rays on spark and electrodeless discharge, 208
Henning resistance of radium solutions, 208 effect of voltage on amount of excited activity, 316
Henning and Kohlrausch conductivity of solutions of radium bromide, 208
Hertz electric deviation of cathode rays, 73
Heydweiler loss of weight of radium, 474
Himstedt action of radium rays on selenium, 208 radium emanation in springs of Baden, 513
Himstedt and Meyer production of helium by radium, 479

547