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 anounces his arrival in Tübingen on 9 Jan. 1925.

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

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.

Pauli thanks Landé for sending him Back's and Landé's papers. He explains theoretically the line intensities in the partial Paschen-Back effect.

Pauli is enthusiastic about Landé's recent paper and the assumption that the optical doublets and X-ray doublets are in principal the same phenomenon.

Pauli writes about his calculations of the Balmerline intensities with the help of Schrödinger's calculus.

Pauli has heard that Landau is enthusiastic about Heisenberg's and his own attempt to incorporate the isogroup into the spinor model with indefinite metric. He enumerates several difficulties of the theory which are not yet solved.

Pauli's interpretation of intercombination lines and the application of his model to several cases (Zeeman-effect). He expresses hope for the progress of physics through Heisenberg's mechanics.