By postulating that infinite relativistic gravitational potentials are to be rejected in the Born-Infeld theory, it is shown that the gravitational mass of an electron becomes equal to its electromagnetic mass, and that difficulties in the usual relativistic treatment of gravitational mass are avoided. The above postulate is extended and its bearing on the alternative sets of field equations of the Born theory, and on a proposal made by the author is discussed.

• Received 8 March 1935

DOI:https://doi.org/10.1103/PhysRev.47.877