Pauli writes about the Lorentz transform of the magnetic moment. He suggests a non-relativistic example of Thomas term.

Pauli expresses doubts about Wentzel's results concerning higher relativity corrections for the H-atom. He makes remarks about the mathematical method used by Wentzel.

Pauli discusses the question of a degenerated gas and compares statistics of Bose-Einstein with that of Fermi-Dirac. Another part of the letter deals with scattering which Pauli does not yet understand.

Pauli writes about the relativistic equations and the expressions for charge- and current-density.

Pauli discusses the properties of spin matrices and efforts toward a quantum electrodynamics.

Pauli suggests postponing his visit to Copenhagen. He talks about his work on quantum electrodynamics and makes a criticism of Klein's paper in the Zs. f. Phys. Pauli thinks that Klein is not ready to see the use of multidimensional spaces as an inherent part of the approach of quantum phenomena.

This letter is a reply to Bohr's letter of the 15th July. Pauli writes about Jordan's manuscript. He criticises its last paragraph where Jordan does not distinguish between the particles (de Broglie field) and the electromagnetic field. He talks about Jordan's and his own work on radiation electrodynamics in the absence of charged particles. He also writes about a paper by de Broglie in the Journ. de Phys. which attempts to harmonize between dualism of waves and corpuscles on the one hand and complete determinism of physical events on the other hand.

Pauli asks if Kronig would be ready to be his assistant in Zürich. He writes about the conditions and colleagues there.

Pauli says that he will write to Kronig next year.

Pauli comments on a paper by Weyl published in Z. Phys. about quantum physics and group theory.