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Heisenberg asks Pauli if he would be ready to take over part of the paper to be given at the Solvay congress on elementary particles: 1) "on the general properties of elementary particles", 2) "the special empirical forms of interaction and their consequences", 3) "the limitations of the present theory". He was interested in what Fierz told him about gravitational quanta of spin 2.

Heisenberg replies to Pauli's letter. He does not fully agree with Pauli that the inertia of self-energy of the spin is of the order (M.c)/h, because the absorptions of mesons indicate a much smaller cross-section for scattering by protons such as that of Bhabha-Heitler, and because the additional inertia does not change the nuclear forces. The spin-inertia plays a role only in the case of rapidly changing fields. He agrees with Pauli's remark on electron spin.

Pauli is glad that Heisenberg's last letter of the 1st May has clarified the problem of frequency dependence of additional terms in Heisenberg's equation. He gives an outline of his paper for the Solvay congress.

Heisenberg has sent copy of his Solvay-report also to Bohr. He writes about his trip to the USA.

Pauli makes a short remark on the application of quantum-mechanical formalism to classical theories.

Heisenberg asks about the program of the forthcoming conference in Zürich.

Pauli makes some remarks on the present state of the meson-theory. He writes about measurements of energy density, charge density and particle density. Ha also makes some personal reports on common colleagues.