The letter describes a problem of classical theory of harmonics. It talks about Pauli's calculations on Bohr's He-Model. He looks forward to his work in Copenhagen.

Pauli complains to Bohr for taking Kramers with him to England at a time when himself is so much in need of Kramers' company.

Pauli announces his visit in Leiden and asks Ehrenfest to read his last paper on the H-theorem in order to discuss it with him.

Pauli makes critical remarks about Fierz's attempt to develop a relativistic cosmology of a world free of matter and containing only light.

In this letter, Pauli makes some remarks on Jordan's cosmology and the ergodic theorem in quantum mechanics.

Pauli writes about the results of his discussion (with Källén) of the motion of V- and N-particles in the Lee model, and is now more optimistic about Heisenberg's interpretation. He has questions which still have to be clarified.