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.

Pauli takes an interest in Jauch's scientific development and hopes to find a position for him. He writes of his own work with Fierz. He hopes to succeed in getting rid of the spinor-calculus.

Pauli urges Jauch to take his final examination so that he could come to Zürich if Fierz goes to Basel.

About the postponement of the Zurich congress.

Pauli writes the decision to postpone Zürich physics congress.

Pauli talks about the integration of Maxwell's equations in Schrödinger's ringcoordinates.