- Soil radio-activity of, 507 et seq. difference in activity of, 508 et seq.
- Solution coloration of, by radium, 15 of active deposit in acids, 312 electrolysis of active, 313
- Source of thorium emanation, 261 of radium and actinium emanations, 263
- Spark action of radium rays on, 208
- Spectrum spark spectrum of radium, 15, 16 flame spectrum of radium, 17 effect of a magnetic field on spectrum of radium, 17 of polonium, 23 of phosphorescent light of radium bromide, 206 of emanation, 292 of helium in radium gases and emanation, 477
- Spinthariscope description of, 158
- Springs emanation from water of, 513
- Stark energy to produce an ion, 58
- Stoney, Johnstone use of term electron, 76
- Strauss and Hofmann radio-active lead, 27
Table of Contents
INDEX.
558