[135] R. A. Millikan, Phys. Rev., XXXII (1911), 397.

[136] J. J. Thomson, Phil. Mag., XI (1881), 229.

[137] Bucherer, Annalen der Physik, XXVIII (1900), 513.

[138] The inadequacy in this argument arises from the fact that Einstein’s Theory of Relativity requires that all mass, whether of electromagnetic origin or not, varies in just this way with speed.

[139] Bragg, Phil. Mag., VIII (1904), 719, 726; X (1905), 318; XI (1906), 617.

[140] Phil. Mag., XXI (1911), 669.

[141] Phil. Mag., XXI (1911), 669-88.

[142] Ibid., XXV (1913), 604.

[143] Phil. Mag., XXI (1911), 648.

[144] Bragg, X-Rays and Crystal Structure, 1915.