[181]. Rutherford and McClung, Phil. Trans. A. p. 25, 1901.
[182]. Meyer and Schweidler, Wien Ber. 113, July, 1904.
[183]. Rutherford and Grier, Phil. Mag. Sept. 1902.
[184]. Becquerel, C. R. 129, p. 912, 1899.
[185]. Bary, C. R. 130, p. 776, 1900.
[186]. Kunz and Baskerville, Amer. Journ. Science XVI. p. 335, 1903.
[187]. See Nature, p. 523, March 31, 1904.
[188]. Crookes, Proc. Roy. Soc. 74, p. 47, 1904.
[189]. Kunz and Baskerville, Science XVIII, p. 769, Dec. 18, 1903.
[190]. Beilby in a recent communication to the Royal Society (Feb. 9 and 23, 1905) has examined in some detail the production of phosphorescence by the β and γ rays of radium and has put forward a theory to account for the different actions observed.