Pauli makes some objections to Thomas' derivation of the missing factor in magnetic interaction of the spinning electron. He is opposed to its publication.

Pauli describes the theoretical tasks if the spinning electron is correct. He criticizes Thomas' relativistic derivation, published in: Nature : 117 (1926), 514.

Pauli talks about Bohr's paper on the statistical interpretation of quantum results which has its origin in the decision between observed object and measuring instrument. Critical remarks are made on the paper, but Pauli is still very positive about Bohr's conception, especially his view that the stationary states are as real as the particles themselves.

Pauli writes about intercombination lines, and perturbations between singulet and triplet lines in Hg. He speaks about the formulas for the relative intensities of multipletlines and the problem of resonance radiation.

Pauli discusses and criticizes the Sommerfeld and Unsöld's paper on spectroscopy and their electron-spin idea for hydrogen fine structure.