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Pauli comments and questions in connection with Heisenberg's letter of 26 December which Pauli regards as a progress.

Heisenberg talks about the generation and elimination of ghost-states, with special reference to his own theory.

Heisenberg writes of the results of his latest calculations. The non-linear interaction leads not only to the vanishing of the o-functions on the lightcone but also to vanishing of the transitions to the dipole states (limes of dipole ghosts).

Pauli gives some qualifications of his last arguments about the proportion of the S-matrix.

Heisenberg asks Pauli's advice as regards the 2N+$\Theta$- problem which again is not clear to him.

Pauli preliminarly replies to Heisenberg's last letter. He does not agree with Heisenberg's treatment of the mathematics of the problem. He writes of a recent letter from Princeton with the news about Mrs. Wu's experiments with "killing" parity. He thinks that agrees with a suggestion by Salam who connected the laxk of left-right symmetry with the vanishing of the rest mass of the Neutrino.

Pauli writes on the recent developments in connection with the violation of parity. As appendix: jocular announcement of the death of parity, signed by e, $\mu$, v written the 19 January 1957.

Pauli sends forms to be filled out for CERN.

Pauli talks more about dipole ghosts. He thinks the indefinite metric is not suitable for solving the problem of elementary particles.