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.

Pauli gives some suggestions for a joint meeting with Born in Bolzano. He comments on the theory of holes in the light of Peierl's results.

Pauli congratulates Heisenberg on the receipt of the Nobel prize. He gives some comments and calculations on the theory of holes. he believes that the problem of the neutrino is connected with that of holes.

Pauli doesn't accept Heisenberg's arguments in his letter of the 12 November 1933 and shows by calculations his objections.

Pauli compares Heisenberg's formalism with that of Dirac and gives some calculations of certain matrices.

Pauli makes additional remarks to the calculations on the theory of holes.

Pauli writes of his impression of Dirac's manuscript and gives a short precis of Dirac's ideas. He makes more remarks on the problem of self-energy.

Pauli writes about the question of finiteness or infinity of charge density in the hole theory.

Pauli writes of his discussion with Weisskopf about Heisenberg's letter to the latter. The result is electrical polarizability of vacuum and self energy are analogous phenomena. The perturbation formalism of substraction-physics can lead to the removal of these phenomena.

Pauli has come to the conclusion that the results of his last letter were wrong, self-energy remains infinite. But it is different with the self-energy of charged particles.