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Pauli refers briefly in this postcard to a paper written by Fock (in: Z. Phys. : 57 (1929),pp.261), to the "Fernparallelismus" of Einstein in which he does not believe, to a relation made by Fürth connecting radii and masses of electron and proton with c and h.

Pauli writes about the excess of the scattered radiation over the Klein-Nishina formula and its possible interpretation on nuclear effect.

Pauli congratulates Klein on his work, his new position and remarks on physics in Sweden and Klein's work. Pauli describes his attempts to treat beta decay using "neutron" hypothesis. Pauli gives arguments against failure of energy

Pauli writes about a review of Gamow's book, written by Pauli.

Pauli states again his conjecture that a penetrative radiation is emitted in the Beta-decay. He also repeats his more important that conservation of energy and momentum in nuclear processes is conservation of all quantized quantities and the law that the symmetry character of the total system is not changed. by such a problem. He discusses relations between proton and neutron, and in great detail, the theory of holes.

Heisenberg writes about calculations about the theory of holes and on the self-energy of a particle. He replies to Pauli's question about the scattering of neutrons by protons and the difference between exchange forces and regular forces. He writes on the decay of the neutron and on his discussion with Bloch about the spin of the neutron being opposite to that of the proton.