. The Bell System technical journal . Fig. 3. Pleochroic haloes (B. Gudden, Physik) a. Rings of UI and UII (innermost, merged into a single broad ring), lo, and Ra. b. Rings of RaF (innermost), Rn, RaA and RaC c. Rings of various substances of the uranium-radium series. Magnifications665, 500, 480 respectively. series which disintegrate in this way. There are no extra rings in thesehaloes, which strengthens the presumption that no radioactive sub-stances in either series lie undetected. But there are also haloes ofwhich the rings have not the proper radii to be identified with anyknown r
. The Bell System technical journal . Fig. 3. Pleochroic haloes (B. Gudden, Physik) a. Rings of UI and UII (innermost, merged into a single broad ring), lo, and Ra. b. Rings of RaF (innermost), Rn, RaA and RaC c. Rings of various substances of the uranium-radium series. Magnifications665, 500, 480 respectively. series which disintegrate in this way. There are no extra rings in thesehaloes, which strengthens the presumption that no radioactive sub-stances in either series lie undetected. But there are also haloes ofwhich the rings have not the proper radii to be identified with anyknown radiating substance. Are these possibly evidence for the pre-historic existence of others belonging to other series, all of which weretoo short-lived to survive into the days of scientific research, but dis-appeared with the dinosaur and the pterodactyl? CONTEMPORARY ADVANCES IN PHYSICS 85 There is an interesting and important relation between the initialspeeds of alpha-rays and the half-periods of the substances which emitthem. One v
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