Pauli wants to see Landé's manuscript. He also talks about the displacement of terms in strong fields.

Pauli thanks Landé for sending him the proofs of his paper. He comments on several points. He talks about the binding of the electrons in the He-atom.

Pauli asks if Bohr could go through Heisenberg's manuscript dealing with a new conception of the Zeeman-effect.

Heisenberg writes about Pauli's remarks on a paper by Born and Heisenberg.

The letter talks about Pauli's visit to Copenhagen in April and about the progress he made in the kinetic of heat conduction in solids.

Heisenberg writes on technicalities about a possible meeting between him and Pauli.

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.