Hulthén comments on Jauch-Ning Hu's note published in: Physical Review: (May 1944), on nuclear quadrupole moment, on the implications of Amaldi's scattering results for theory of heavy-nuclei saturation, on his own publications and on the war situation in Holland.

Gustafson reports on work arising from his "addition in proof". He asks if C E Fröberg could visit Zürich.

Gustafson is sending Gunnar Källén to Pauli. He reports on Fröberg's scattering work and he is creating a post for Bradt.

Källén writes on his recent attempts to simplify the calculations on quantum electrodynamics.

Nilsson reinterprets Rydberg's "triplets". He gives a modern level scheme.

Källén talks about calculation on an integral-representation of the S$_{c}$-function, avoiding the complex method of integration.

Källén encloses a manuscript dealing with the contents of his last letter of the 12 December 1949, in addition to a calculation on bosons in an external field.

Nilsson reports on Siegbahn's response to Pauli's inquiries about Rydberg's new elements of 1913.

Källén talks about some general observations on the mathematical formalism of the Lee model.