Note 12 — § 2. The Effect of an Electric Field.

Note added during the proof.—In Verh. d. Deutsch. Phys. Ges. 1914, p. 20, K. Schwarzschild has discussed the problem of the effect of the field on the motion of the electron in some detail. In contrast to the above considerations he attempts to apply the results on the explanation of the Stark effect without leaving ordinary electrodynamics.