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Pauli replies to Källén's letter of the 10 March 1955. He suggests destroying the Lorentz invariance through the cut-off of the interaction energy in momentum-space. He writes on the validity of Born's approximation.

Heisenberg writes a summary of his theory: axiomatics, properties of elementary particles, ghosts.

Pauli replies to Weisskopf's letter. He asks why the cut-off radii of the proton and the neutron are exactly equal. He makes remarks on the quantum theory of fields, and Landau's contribution to this problem. He writes about Schindewolf's book on evolution recommended to him by Weisskopf.

Pauli talks to Bohr about his opinion concerning the Bertrand Russell document on peace. He also writes about their relativity meeting in Bern. Max Born will try to be there.