Pauli sends some comments and calculations on the representations of the Lorentz group to the work of Fierz and of Gelfant.

Pauli writes of his reading of the paper by Lee published in: Physical review, 95, and his correspondence about it with Källén. As appendix he includes a quotation from Max Abraham on a doctoral student.

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

Pauli writes about the destruction of symmetry between the "internal" and "external" in our age. Science systematically excludes the observer from its results. Since Kepler, there has been no mystic in science. He also comments on a talk with Panofsky on the parallel between the myths of paradise, Eve, and the Pandora's box.

Pauli comments on a philosophical manuscript by Fierz concerning the methods of classical physics and of quantum physics.

Pauli writes of another possibility of mixing Hamilton functions in special reflections.

Pauli makes some suggestions for a seminar talk to be given by Fierz.

Pauli writes on the question of the conservation of lepton charge in connection with Majorana's theory.

Pauli continues his discussion with Fierz about his mathematical treatment of the particle-antiparticle problem.