About a report or speech by E. von Kahler on history. Remarks on the concept of history.

Pauli sends some comments and calculations on Dyson's paper on "longitudinal photons".

Pauli writes about an error in a manuscript by Heisenberg. He comments on discussions with Pais.

Pauli replies to Thellung's letter of the 19th January 1956. He agrees with his view on the renormalization of the meson charge. He writes about the problems of higher approximations and about Rohrlich's work on the electrodynamics of charged scalar mesons.

Pauli asks Thellung to send him a paper about time reversibility.

Pauli thanks Delbrück for the copy of his lecture. He hopes that biology will soon have a development analogous to that of physics from 1900 - 1905. He is interested in processes in living organisms which cannot be explained by quantum mechanics. There may exist in living organisms, besides statistical laws, an additional interdependence which might explain biological evolution.

Pauli writes about a seminar talk by Van Hove on Feynman's paper.