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Pauli is excited about the experimental confirmation of parity violation.

Heisenberg talks about his recent results giving tentative proof that in all sectors of the Lee model with dipole ghost the S -matrix is unitary.

Pauli asks some questions and makes some remarks concerning the violation of parity. He pursues the letter on two dreams and makes an addition to a discussion about dipole ghosts.

Heisenberg writes on clarification of the question of the existence of a solution for the integral equation containing a simple pole. He gives his opinion on Källén's calculations.

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.