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In this reply to a letter from Pauli, Bohr develops his exclusion principle and attempts to explain this rule in the framework of the electronic orbit model.

Pauli writes about electron configurations in the elements K to Cu, and about the question of clarification of the hydrogen spectrum and its analogy with a reduced X-ray spectrum.

Pauli makes more remarks about the H-atom and its spectrum.

Heisenberg writes about the polarization of spectral lines in electric and magnetic fields according to quantum theory.

Heisenberg says that in his new mechanics, the geometrical concept of orbit has no sense, as orbits are not observables.

Pauli's interpretation of intercombination lines and the application of his model to several cases (Zeeman-effect). He expresses hope for the progress of physics through Heisenberg's mechanics.

Bohr thanks Bohr for his letter of the 25th September.

Heisenberg writes about Bohr's optimism as regards Goudsmit's theory and gives some additional comments on it.

Pauli writes about mathematical contributions to the quantum-mechanical calculus.