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Bhabha's and Heitler's assumptions confirm Heisenberg's idea of the necessity for introducing a universal length. He writes about difficulties in the interpretation of cosmic radiation experiments with the Yukawa theory.

Heisenberg thinks, after receipt of Yukawa's paper, that his Hamiltonian is better than that of Kemmer or Bhabha. He writes on the Beta-instability of the yukon. He sends Pauli a short paper on the limitations of quantum mechanics and asks for his comments.

Heisenberg writes on the impossibility of measuring the power law exp (-k.r)/r at large distances and about Stark's article in "Nature".

Pauli writes mainly about books. He recommends C Morgan's "Sparkenbroke" whose religious approach is reminiscent of gnostic ideas.

This letter is an addition to the letter of 15 April.

Pauli thanks Kemmer for his letter and his satisfactory results.

Pauli writes about the interchange relations in the meson theory of the vacuum.

This letter contains another mathematical question in connection with an equation in de Broglies's theory which Pauli wants to criticize in his report to the Solvay-congress.

Pauli writes about the mathematics of hyper-complex numbers and the application for the case of higher spin.

This letter contains more calculations with hyper-complex numbers and applications to systems of particles with given spin.