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Pauli replies to Heisenberg's letter of 1st January. He is not convinced that dipole-"ghosts" cannot appear in Lee's model and gives some reasons for this.

Pauli regards Heisenberg's letter of 31 January as showing new progress. He talks about the mathematical difficulties of the Lee model and a general charaterization of the class of models with indefinite metric.

Mathematical appendix to the last letter.

Pauli writes about the results of his discussion (with Källén) of the motion of V- and N-particles in the Lee model, and is now more optimistic about Heisenberg's interpretation. He has questions which still have to be clarified.

Pauli makes a few more remarks on Heisenberg's manuscript.

Pauli replies to Heisenberg's letter of 17 June, on pedagogical questions and on questions of principle.

Pauli talks about some remarks by Källén on Heisenberg's manuscript.

Pauli replies to Heisenberg's letter of the 9 December. He writes on the question of "real" and "complex" ghosts.

Pauli talks about the isotopic spin problem for charged particles.

Detailed exposition of his suggestion about vacuum-expectation values. This nearly concludes the subject "interpretation of isospin".