1. Cf. Rutherford Chadwick EllisRadiations from Radioactive Substances143 143et seq.
2. Rutherford , Chadwick and Ellis .Radiations from Radioactive Substances252–252.
3. 1931.Bulletin de la Soc. d. Chim. d. Belgique, Jan.
4. Multiple Valency in the Ionization by Alpha Rays