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Pauli is glad that the problem of the vacuum expectation value of the product of three field operators has been further clarified. He talks about Beta decay. He is convinced that reflexion invariance prevails in nature against of Lee, Yang and Salam.

Pauli reports on a work about field quantization. He writes about Jost's and Lehmann's paper on dispersion relations. Pauli thinks that there methods are to specific and connot be generalized withoud a new idea. He works on the theory of Beta-decay a the postulate of conservation of total lepton charge. He believes in left-right invariance and in lepton-gauge-invariance. He writes about a Polish physicist in Zürich. He makes observations about the relations between Poles and Russians.

Heisenberg has some considerations proving the near relation between his work and the Lee-model.

Addition to the last letter about Heisenberg's calculations.

Pauli gives more calculations and questions about Heisenberg's formalism.

Heisenberg makes a tentative reply to Pauli's question about dipole ghosts.

Pauli comments on a letter by Källén and his problem of two N-particles.

Pauli gives a more precise formulation to the problem of dipole ghosts and an another solution. He also discusses approximation through complex roots.