I. Radio-active Substances 1
II. Ionization Theory of Gases 31
III. Methods of Measurement 82
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
XIV. Radio-activity of the Atmosphere and of Ordinary Materials 501
Appendix A. Properties of the α Rays 543
Appendix B. Radio-active Minerals 554
Index 559
Plate (Fig. 46A: Spectrum of Radium Bromide) _to face p._ 206
* * * * *
For the convenience of the reader, the sections and chapters which contain mostly new matter, or have been either partly or wholly rewritten, are appended below.
Chap. I. Sections 18, 20–23. „ II. „ 48–52. „ III. „ 69. „ IV. „ 83–85, 92, 93, 103, 104, 106–108, 111, 112. „ V. „ 115, 117, 119, 122. „ VII. „ 171–173. „ VIII. „ 182–184, 190. „ IX-XIV. Mostly rewritten.
