Pauli thanks him for his letter of 26 Dec. He would like to hear more from him about Heisenberg's S-function. He writes about the translation of Pauli's handbook article into Japanese.

Pauli replies to Kemmer's letter (14 February) to Fierz. He talks about his forthcoming lectures on field quantization and gives some remarks on Dirac's equations for particles with higher spin.

Pauli asks a question about a possible magnetic spin moment of yukons, and calculations in connection with this.

Pauli writes again on the question concerning de Broglie 's equation.

The letter talks of progress in meson theory.

The letter is about the impending visit of Pauli to England and Scotland.

The letter asks a question about a model for neutrinos with Delta-like interaction.

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

Pauli thanks Kemmer for his letter and his satisfactory results.