Pauli sends a list of people to whom preprints of their paper should be sent. He comments the reaction of Heisenberg and his pupils to the paper.

Pauli writes on the non-physical ("pathological") solutions of quantum electrodynamics in case of strict validity of Lorentz-invariance. The mathematical consequences of this: "ghosts" and macroscopic acausalities and the postulate that for large photon- and quantumnumbers of electrons the classical theory must result as limiting case of quantum electrodynamics. One has to look if the equations of quantum electrodynamics have solutions which fulfil these three consequences.

Pauli's reply to Bohr's letter of 2 March. He writes about the meaning of "detached observer" and "objective description" in physics and the difference between these terminologies. He talks about the scientific inspiration of mysticism and its counterbalance in mathematics.

Pauli reports on a model of Thirring's and about a modification of the Lee model, which avoids negative probabilities.

Bohr asks Pauli about his intentions for their relativity meeting in Bern. He writes about a political proposal concerning peace written by Bertrand Russell and sent to many scientists including Pauli and Bohr.

Pauli makes some remarks on Heisenberg's "Hilbert-space II", and replies to Heisenberg's criticism of Landeau's work.

Pauli replies to three questions of Jordan: 1) on heat conductivity, 2) on his possible visit to Hamburg, 3) on a problem which Delbrück might be able to answer.