INDEX.

Radium discovery of, 13 separation of, 13 spectrum of, 16 atomic weight of, 17 radiations from, 18 compounds of, 19 nature of radiations from, 109 β rays from, 113 α rays from, 141 γ rays from, 179 secondary rays from, 187 production of phosphorescence by, 201 et seq. spectrum of phosphorescent light of, 206 physical actions of, 207 et seq. chemical actions of, 213 et seq. physiological actions of, 216 emanation from, 246 properties of emanation from, 247 et seq. chemical nature of emanation from, 267 diffusion of emanation from, 269 condensation of emanation from, 277 amount of emanation from, 288 volume of emanation from, 289 spectrum of emanation from, 292 excited radio-activity from, 295 et seq. decay of excited activity from, 306 et seq. difference in properties of radium and the emanation, 327 nomenclature of products, 328 theory of successive changes in, 330 alteration of activity of, by removal of emanation, 371 et seq. recovery of activity of, after removal of emanation, 372 effect of escape of emanation on recovery of activity of, 374 non-separable activity of, 375 period and properties of radium A, B and C, 376 et seq. analysis of active deposit of rapid changes of radium, 377 analysis of β ray curves, 381 et seq. analysis of α ray curves, 386 et seq. equations of activity curves, 389 effect of temperature on active deposit of, 390 relative activity due to products of, 395 active deposit of slow transformation, 397 physical and chemical properties of radium D, E and F, 398 et seq. effect of temperature on active deposit of slow change, 401 separation of radium F by bismuth, 402 products of, 402 et seq. rate of transformation of radium D, 404 et seq. variation of the activity of the active deposit over long periods of time, 407 amounts of radium D, E and F in old radium, 408 variation of activity of, with time, 409 products of in pitchblende, 410 origin of radio-tellurium, 411 origin of polonium, 411, 412 origin of radio-lead, 413 temporary activity of inactive matter separated from pitchblende, 415 et seq. heat emission of, 419 et seq. heat emission of emanation from, 420, 431 heating effects due to products of, 433 theories of radio-activity of, 437 et seq. discussion of theories of radio-activity of, 441 et seq. energy of radiations, not derived from external source, 442 et seq. theory of radio-active change, 444 et seq. list of active products of, 448 amount of products of, 452 rate of change of, 457 life of radium, 457 origin of, 459 et seq. production of, by uranium, 459 et seq. amount of in 1 gram of uranium, 461 amount of, in minerals, 461 radio-activity of, independent of concentration, 466 et seq. disappearance of, 467 life of, independent of concentration, 468 conservation of radio-activity of, 469 et seq. loss of weight of, 473 experiments to determine loss of weight of, 474 total emission of energy from 1 gram of, 474 et seq. production of helium from, 476 helium, disintegration product of, 479 et seq. amount of helium from, 480 possible causes of disintegration of, 486 et seq. amount of, to account for heat of sun, 491 possible connection of with heat of sun, 491 possible connection of with heat of earth, 493 probable amount of, in earth, 495 amount of, in atmosphere, 495, 524 presence of, in atmosphere, 521 et seq.
Radium A decay curve of, 378 radiation from, 381 effect of, on activity curves, 386 et seq. connection with later changes, 392 activity supplied by, 393
Radium B absence of rays in, 381 effect of, on activity curves, 381 et seq. effect of temperature on, 390 volatility of, 390 absence of heating effect of, 433 nature of rayless change in, 454, 552

553