[441]. Patterson, Phil. Mag. August, 1903.
[442]. Harms, Phys. Zeit. 4, No. 1, p. 11, 1902.
[443]. Cooke, Phil. Mag. Oct. 1903.
[444]. Wilson, Proc. Roy. Soc. 69, p. 277, 1901.
[445]. Jaffé, Phil. Mag. Oct. 1904.
[446]. Patterson, Phil. Mag. Aug. 1903.
[447]. Strutt, Phil. Mag. June, 1903. Nature, Feb. 19, 1903.
[448]. McLennan and Burton, Phys. Rev. No. 4, 1903. J. J. Thomson, Nature, Feb. 26, 1903.
[449]. Cooke, Phil. Mag. Aug. 6, 1903. Rutherford, Nature, April 2, 1903.
[450]. Eve, Nature, March 16, 1905.