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Pauli replies to Källén's letter of the 13 December 1957. Pauli agrees with him that the indefinite metric is the correct way. He talks about the macroscopic space-time description with complex roots and the Bisection of zero-states in parts corresponding to the upper and lower half-plane which must be connected with the difference between observed object and observing subject. By this bisection symmetric violations are introduced in a most natural way. He writes on his discussion with Heisenberg and on complex ghosts in weak interactions.

Pauli replies to Heisenberg's letter of the 16 December and discusses the formalism and correction of a mistake Pauli made. He writes on group theoretical considerations.

Heisenberg states the points on which he and Pauli agree. He asks Pauli's view on several other points.

Heisenberg puts a question about the transformations of two continuous groups in his "electrical" theory. If this is solved, the problem of strange particles leptons can be tackled.

Pauli talks about the logical possibility of getting particles with mass different of zero in a world with $\gamma_{s}$-invariance and hints at another "unconventional" solution of the problem.

Heisenberg disagrees with Pauli's letter and gives a new exposition of the relation between $\psi$* and $\psi$+.