Pauli sends a manuscript of his article for the Bohrfestschrift to Lüders. He asks if some equations related to the interaction of charged bosons with protons and neutron spinors can be found already in earlier literature. He talks about commutability and anticommutability of independent fields with half-integer spin.

Pauli agrees with Källén about the correctness of the mathematics of the Lee-model. He writes on a question where to publish the paper. He agrees with Källén that Heisenberg's idea about the derivation of the electromagnetic field from spinor-fields must be wrong. He hopes that an improved renormalization mathematics might lead to a sort of eigenvalue-problem for the fine-structure constant.

Pauli replies to Fierz's letter of the 15th December 1954, in particular about the "ghosts" (negative probabilities) in quantum electrodynamics and about the shortcomings of renormalization physics.

Pauli sends further remarks on the state of quantum electrodynamics and he writes on Schafroth's work in Australia.

Pauli writes about a dissertation by Mr Choquard.

Pauli criticises a paper by three pupils of Heisenberg on "the formulation of quantized field theories". He makes some remarks on Lee's model.