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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.

Heisenberg replies to Pauli's calculations on hydrogen according to quantum mechanics and makes some remarks on his results.

Heisenberg replies to Pauli's letter. He fully agrees with Pauli's considerations regarding impact processes, which clarify the physical meaning of Born's formalism. He talks about the physical reality of Pauli's p-waves and the indeterminacy relations. Space and time can be applied only to many particles, like temperature and pressure in a gas. He writes about the meaning of the matrix-elements and on the concept of fluctuation of electrical density.

Heisenberg sends Pauli his manuscript, on the whole identical with his long letter. He writes about the postulate character of his quantum mechanical assumption and its similarity with the assumption of the constancy of light velocity.