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Heisenberg replies to Pauli's letters of 19 and 20 March. He suggests a new version of the interpretation of the theory: she is CP-invariant. Therefore the symmetry is not affected in weak interaction. Further possible consequences of this interpretation.

Heisenberg sends Pauli his Geneva lecture and notes of the discussion, prepared by Ferretti. He adds a correction of the results for the Pi-eigenvalues, after Schlieder's discovery of a mistake in the calculations.

Heisenberg formulates the points on which he and Pauli agree. The main problem remains: would a quantization with positive metric and $\sigma$-functions be possible.

Heisenberg writes about the quantum theory of the Zeeman effect. He makes a comparison with a paper by Bohr.

Heisenberg writes about the enumeration of quantum numbers and in particular the value for k.

Heisenberg replies to Pauli's letter about quantum numbers. He also writes on Pauli's use of the summation principle for the calculation of Lande's g value and on the difficulties of the doublet-theory.

Heisenberg writes more about the intensities of spectral lines.

Heisenberg writes about Pauli's coming to Copenhagen. He reports on his recent work.

Heisenberg writes more about the polarization of Stark effect components, about Heisenberg's new quantum mechanics, about the principle of the use of "observables"and about the equations for the harmonic and anharmonic oscillators.