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 replies to a letter by Landé criticizing a theory which he develops.

Pauli thanks Miss Meitner for her paper for the Bohrfestschrift.

Pauli reports on exchanges with Einstein and Baade on relativity. He suggests topics, participants and scope of the Bern relativity congress, 1955.

Pauli says that the difference of opinion about the sign of vacuum polarization is resolved. He writes about the work of his doctorands, and about his debate with Born on the properties of a certain operator.

Pauli gives his opinion on the present situation of quantum electrodynamics.

About Harold Bohr's death and birth of Aage Bohr's child.

Pauli says that the magnetic moment of the triton can only be accounted for by the use of exchange current.

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

Pauli reports on the congress in Rochester. He writes about his discussion with Fermi about the neutrino experiments. He writes also on a talk about a new paper by Feynman.