1. Introduction: light quantum theory and quantum electrodynamics.

2. Extreme light quantum theory; spin of quantum; wave equation for quanta; eigenwerte and solutions of the equation; electrostatic quanta; angular momentum and selection rules; Lorentz covariance; theory of the charge-free field; quanta and electrons.

3. Quantum electromagnetics; reformulation to treat progressive and spherical waves; integrals of momentum and angular momentum; new introduction of light quantum equation; distinction between field and corpuscular theories; zero point energy, negative energies, and electromagnetic mass.

4. Interaction of quanta and charges; critique of light quantum theory.

• Received 26 June 1931

DOI:https://doi.org/10.1103/PhysRev.38.725