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 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.