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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.

Heisenberg objects to Pauli's analogy between quantum mechanics on the one hand and quantum electrodynamics and classical Maxwell theory on the other hand. There is not only Maxwell's equations must be quantized, but also the De Broglie Waves. He explains his ideas on the intuitive meaning of quantum mechanics: 1) position of the electron 2) "orbit" of the electron. He agrees with Dirac that their experiments introduce statistics 3) on the "velocity" of the electron. 4)the transition from micro- to macro-mechanics. He writes that every new observation defines a new state. There are a few examples as illustrations.

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.

Heisenberg writes about Pauli's and Jordan's preliminary considerations about quantum electrodynamics.

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.