The letter talks about some results of the application of "substraction-quantumelectrodynamics" to a higher approximation of the Compton-effect.

Pauli refers to an introduction by Bernays to a discussion on probability in: Dialectica : 7, no.4, and makes some critical remarks on Bernays's statement at the end of his introduction (p. 321).

Pauli thanks them for the received papers. The letter gives an account of Thirring's cut-off method and its preliminary results in the case of a scalar field interacting with a fermion field. Pauli believes that a good new theory is only possible on the basis of entirely new physical ideas. In connection with that, he is impressed by a remark by Landau on a connection of a cut-off moment of quantum electrodynamics with gravitational interaction.