Pauli writes about the question of whether n or k determines the total moment of the atom.

Heisenberg writes on the anomalous Zeeman effect.

(In continuation of a letter by Sommerfeld to Landé) Pauli says that he has studied Landé's work about interaction of circular orbits by means of the adiabate-hypothesis and that he can show a simpler way to arrive at the result.

Heisenberg replies to Pauli's critical remarks about his last letter.

Heisenberg writes on the quantization of the outer electron of an atom on weak external magnetic fields and in increasing fields until the Paschen-Back-effect.

Heisenberg writes on stability considerations in H$_{2}$ and about failure of the energy-calculations for He.