Gustafson discusses a possible solution of the Dirac equation using "analytical combination" and the work of student S B Nilsson.

Gustafson sends a paper on mesons.

Gustafson writes on the congress in connection with the inauguration of the institute in Lund.

Gustafson briefly describes Bertil Nilsson's work.

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

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

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.

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

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.

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