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Fierz comments on a paper by Bargmann and Wigner, and some calculations as regads the quantization of the Wigner theory published in: Zeitschrift für Physik (1948), 124, 665.

Fierz gives the conclusions of his letters about the Lorentz group and makes general observations about the problem.

Fierz gives a correction to what he said in Basel about gravitational waves, in particular cylindrical waves.

Fierz sends remarks about Einstein's cylindrical waves, with reference to Weyl's paper published in: Annalen der Physik (1917) 54.

Fierz sends an attempt at an interpretation of Pauli's dream of Pauli about three popes, one of whom was called Johannes.

Fierz comments on a lecture by Pauli on the relations between scientific cognition and salvation.

Fierz makes some remarks on a theory of Pais. The letter is contained in a letter of Pais to Pauli.

Fierz replies to Pauli's letter about Fermi's theory of the $\beta$-decay anti-neutrino.

Fierz discusses the representation of the neutrino by spinor or pseudospinor and the implications of rest mass for the concept of anti-particle.

Fierz writes on various papers dealing with the limes photon mass = 0. He adds to this letter some observations on the physical difficulties of quantum electrodynamics.