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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.

Jordan replies to Pauli's questions as regards Jordan's cosmology with a changing gravitational constant. He believes that it is difficult to separate macro-physical and micro-physical considerations in his theory.

Jordan writes about a forthcoming talk by Pauli in Hamburg.

Jordan replies to Pauli's letter of the 1 October 1952 about the relation of Jordan's "projective" cosmology to that of Kaluza. He writes about possible empirical confirmations of the hypothesis of a changing gravitational constant.