Pauli is glad to have Bohr's letter of May 11th and he hopes that Bohr will soon be back in Copenhagen. Einstein has sent Pauli an article for "Dialectica", which essentially repeats his old arguments. Pauli encloses copies of his letter to Einstein and also his reply. Pauli did not agree with Einstein's point of view expressed in his letter and he did not continue this correspondence. Pauli urgently needs Bohr's promised article for "Dialectica". A short address clarifying some concepts used by Bohr would be sufficient without any discussions of historical questions. They all hope that Bohr will be able to come to the conference in Zürich.

Pauli thanks Bohr for his letter of the 16th October 1948, containing the revised version of the Einstein article and the "Dialectica" article. He makes some comments on his editorial survey. He asks Bohr about a contribution to a physics meeting in July 1949. He also reminds him of Sommerfeld's 80th birthday.

Pauli refers briefly to a paper by Sachs on the magnetic moment of the deuteron.

Pauli expresses his enthusiasm over Dirac's Bakerian lecture and makes several comments on it.

Pauli invites Ehrenfest to lecture on X-ray physics in a meeting in Zürich. He refers to the Ellis-Wooster heat experiment.

Pauli makes further remarks about the H-theorem.

Pauli sends more remarks about "psychophysics" with references to the ideas of Scotus Erigena, and to a text of the 17th century mentioned in Jung's "Psychology and alchemy". He also writes on the relations between alchemy and Platonism and on Newton's concept of space.

Pauli writes on his meeting with Fierz in Basel.