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  from active deposit of radium, 377 et seq. significance of appearance of, only in last radio-active changes, 455 change of weight due to expulsion of, 473 Barium platinocyanide phosphorescence of, under radium rays, 203 change of colour due to radium rays, 205 Barkla polarization of X rays, 80 Barnes and Rutherford heating effect of radium emanation, 421, 429 connection of heating effect with radio-activity, 421 heating effect of active deposit, 425 heating effect of γ rays, 429 heating effect of emanation, 431 division of heating effect among active products, 433 Bary phosphorescence under radium rays, 202 Baskerville activity of thorium, 29 phosphorescence of kunzite under radium rays, 203 Baskerville and Kunz phosphorescence of substances under radium rays, 204 Beattie, Smolan and Kelvin discharging power of uranium rays, 7 Becquerel rays from calcium sulphide, 4 rays from uranium, 5 et seq. permanence of uranium rays, 6 discharging power of uranium rays, 6 magnetic deflection of radium rays by photographic method, 114 et seq. curvature of radium rays in a magnetic field, 115 et seq. complexity of radium rays, 116 et seq. electrostatic deflection of β rays of radium, 124 et seq. value of e/m for β rays of radium, 126 et seq. magnetic deviation of α rays of radium and polonium, 145 trajectory of rays of radium in magnetic field, 148 scintillations due to cleavage of crystals, 160 γ rays from radium, 179 secondary rays produced by active substances, 187 phosphorescence produced by radium rays, 201 conductivity of paraffin under radium radiation, 210 effect of temperature on uranium rays, 210 chemical action of radium rays, 214 removal of activity from uranium by precipitation with barium, 219 theory of radio-activity, 438 Bemont et M. et Mme Curie discovery of radium, 13 Berndt spectrum of polonium, 23 Blanc thorium in sediments from hot springs, 514 Blythswood, Lord and Allen, H. S. radium emanation in Bath springs, 513 Bödlander and Runge evolution of gases from radium, 215 Boltwood origin of radium, 460 amount of radium in minerals, 460 proportionality of uranium and radium in minerals, 461 production of lead by uranium, 484 radium emanation in spring water, 514 method of standardization of amount of emanation in waters, 514 Boys rate of dissipation of charge, 531 Bragg and Kleeman 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.

Bronson
  use of steady deflection method with an electrometer, 104
  decay of thorium emanation, 242
  decay of excited activity from actinium, 312

Brooks, Miss
  variation of excited activity from thorium for short exposures, 304
  effect of dust on distribution of excited activity, 305
  decay curves of excited activity of radium measured by α and β rays, 307 et seq.
  decay curves of excited activity from actinium, 312

Brooks and Rutherford
  absorption of α rays by matter, 161