Pauli replies to a letter by Dyson that was dealing with the Källén Formula and general problems of renormalization. He emphazises that not every mathematical solution of the renormalized field theory must have a physical letter from Pauli to Lee gives some remarks to a paper by Lee, especially on the consequences of coupling-constant renormalization and about the occurrance of negative probabilities.

Pauli answers a question asked by Dyson on the comparison of the Bohr-Rosenfeld analysis with the mathematical results of quantum electrodynamics for normalized field commutators.

Pauli gives additional remarks on Dyson's calculations.

Pauli makes a comment on a paper by Dyson, which is the first of a series of papers.

Pauli sends the copy of a letter from Pauli to Paul T Matthews (dyson_0065-1). The letter shows that Pauli regardsthe electrodynamics of charged scalar mesons as solved.

Pauli's letter praises Dyson's work. He also asks a question about renormalization technique.

Pauli writes about the connection of renormalization with power series expansion. He makes some remarks on the difficulties of meson theories and on mathematical formulation of fundamental laws of nature. He adds some remarks on his mathematical background.

Pauli's letter discusses some recent Beta-decay experiments in the U.S.A. and their bearing on the parity problem. The two component theory is not tenable in the light of these field theories, a deeper understanding of the parity problem is not possible.

Pauli thanks Eddington for his book on relativity he has sent to him. He explains the reasons for his opinion that Eddington's attempt of a formal unification of electromagnetic and gravitational field have no physical significance.

Pauli would welcome a new assistant. He makes some remarks on breit, Bloch and his physics.