- Actinium B period of, 368 properties of, 368
- Actinium X separation and decay of, 364 et seq. production of emanation by, 365
- Adams decay of activity of emanation from well water, 511 decay of excited activity from the emanation, 511
- Age of radium, 457 of sun and earth, 492 et seq.
- Allan, S. J. increase with time of excited activity from atmosphere, 505 radio-activity of snow, 506 effect of conditions on decay of activity from air, 519, 523
- Allan and Rutherford decay of excited activity from the atmosphere, 503 ionization of air in closed vessels, 534
- Allen, H. S. and Lord Blythswood radium emanation in Bath springs, 513
- Anderson and Hardy action of radium rays on the eye, 217
- Armstrong and Lowry radio-activity and phosphorescence, 444
- Arnold rays from phosphorescent substances, 4
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