Fierz sends further remarks about the possible interpretation of Pauli's dream and on the ambivalent attitude of the physicists towards reality.

Fierz sends various remarks on a letter by Pauli.

Fierz sends some considerations about elementary processes and their connections.

Fierz comments on a paper by Stückelberg on the radiation theory of photons and similar considerations made earlier by Fierz.

Fierz writes of his correspondence with Yang about the latter's paper on a gas of rigid spheres. He also writes of his talk with Villars on the latter's work on collective coordinates.

Fierz sends this letter as an addition to his letter of the 28th February 1947 about Chandra's derivation.

Fierz summarizes Harish-Chandra's work on simplified integration of symmetric-tcp wave functions by Lorentz transformation.

Fierz answers Pauli's questions on the method of tranforming operators suggested by Harish-Chandra.

Fierz withdraws an incorrect remark from his letter of the 17 October 1952.

Fierz replies to Pauli's letter and manuscript of his paper "On the Hamiltonian structure of non-local field theories."