Pauli thanks Landé for sending him the proofs of his paper. He comments on several points. He talks about the binding of the electrons in the He-atom.

Pauli writes about the significance of the quantum numbers.

Pauli talks about a model for the explanation of the Zeeman-effect.

Pauli thanks Landé for his communication about the summation rule.

Pauli writes about his theoretical investigation of the Zeeman-effect. He makes remarks about the validity of Landé's shema for certain multiplets.

Pauli talks about his Zeeman-effect model in the light of Back's experimental results.

Letter written giving Pauli's first impressions of Schrödinger's article "Quantisierung als Eigenwertproblem published in Annnalen der Physik. He develops the connection with the quantum mechanics of the Göttingen Physicists.

Pauli writes about the results of his discussion (with Källén) of the motion of V- and N-particles in the Lee model, and is now more optimistic about Heisenberg's interpretation. He has questions which still have to be clarified.

Pauli talks about a possibility of meeting Heisenberg at the end of the month. He wants to discuss with him the influence of the finiteness of masses on the form of the potential, the wave-mechanical V-N-scattering problem indefinite metric and the paper and lecture by Nishijima.

Pauli makes critical remarks about Fierz's attempt to develop a relativistic cosmology of a world free of matter and containing only light.