Pauli replies to Landé's question about a possible dicontinuity in the behavior of free and very loosely bound electrons.

Pauli asks about the possibility of visiting Copenhagen during his vacation. He says that he met Heisenberg in Copenhagen. He talks about his own work on heat conduction in solids.

Pauli gives a detailed account of his ideas about the anomalous Zeeman effect and the resulting consequences for the building of the electronic shell.

Pauli writes about the respective merits of the "inclination" theory and the relativistic theory of multiplets. He asks questions concerning certain transitions in alkali-spectra and the spectrum of Pb, anticipating Pauli's exclusion-principle.

Pauli says to Landé that he has sent off his paper for publication.

Pauli hopes to come to Copenhagen and to discuss radiation problems. He has now to write a Handbuch article for Springer on the problem of closed shells. He believes in a definite value of momentum of the atom in a stationary state, if this momentum is conceived as a dynamical (not kinematical) quantity. He writes also about the theory of multiplet intensities in an electric field, Ornstein's sum-rules, Kramer's dispersion theory and about the so-called Smekal-jumps (frequency of the external field goes to zero).

Pauli writes about the paper by Bohr, Kramers, Slater and its experimental refutation by Geiger and Bothe. Pauli explains that the concepts of motion and force have to be modified, but not the concept of energy. He writes of his support for Heisenberg's new ideas.

Pauli writes about the success of the hypothesis of the magnetic electron. He writes about the connection of Schrödinger's equation with quantum mechanics. He comments on the conclusions of Heitler's paper on statistics. He writes about the second order Stark effect.

Pauli replies to Schrödinger's letter of the 18th May 1926. He writes about the connection between quantum mechanics and Schrödinger's wave mechanics. He talks about the transition to classical quantum theory for large quantum numbers. He comments on volume integral and on the higher rotational states of the electron.

Pauli discovers a mistake in Uhlenbeck's calculation of a certain integral.