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Pauli sends Heisenberg his calculations on the hole theory. He thinks the whole derivations are cogent, in spite of the starting point which differs completely from Dirac's. He makes some remarks on the neutrino problem. He believes, like De Broglie, that a photon consists of a neutrino plus a neutrino hole.

Pauli makes some theoretical remarks about the connection between self-energy difficulties and the existence of the electric charge.

Pauli writes of his calculations with Weisskopf of polarization effects in changing fields.

Pauli comments on a manuscript by Heisenberg. The important progress lies in the recognition of the fact that all infinities are created by the field quantization. Mathematically things are satisfactory, but physically, no experimental consequences can be expected, because the neglect of the radiation-reaction forces is not legitimate. He remarks on coherent scattered radiation and on Weisskopf's and Delbrück's work on it. He writes of his thoughts on the significance of e$^{2}/(h.c) and of the concept of charge and its conservation.

Pauli sends Heisenberg his calculation on the quantization of the Klein-Gordon equation and explains the results.

Pauli writes of his intention to publish with Weisskopf on the quantization of the relativistic scalar wave equation, and with Bose on statistics. He comments on Heisenberg's ideas about a future unified field theory.

Pauli is disappointed with Heisenberg's letter on nuclear physics. The indefiniteness of the go-functions in Heisenberg's and Majorana's nuclear theory is unsatisfactory.

Pauli replies to questions from Heisenberg in his letter of 4 November 1934. The self-energy of the electron in Pauli's theory becomes logarithmically infinite . This theory can only be developed with Bose-statistics. He writes about the Lagrange function of the scattering of light by light and about the magnetic moment of the neutron and the symmetry of the laws of nature with regard to the sign of the charge. He talks about the magnetic moment of the proton and the deuteron.

Pauli agrees with Heisenberg about V Neumann's paper. He also believes in the significance of a universal length.

Pauli agrees with Heisenberg's suggestion (letter of 2nd February) for the modification of his theory, and adds some remarks on this.