[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]
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.