[IV. Nature of the Radiations] [108]

[V. Properties of the Radiations] [201]

[VI. Continuous Production of Radio-active Matter] [218]

[VII. Radio-active Emanations] [238]

[VIII. Excited Radio-activity] [295]

[IX. Theory of Successive Changes] [325]

[X. Transformation Products of Uranium, Thorium and Actinium] [346]

[XI. Transformation Products of Radium] [371]

[XII. Rate of Emission of Energy] [418]

[XIII. Radio-active Processes] [437]