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Pauli writes to Heisenberg about a letter from Laue who thinks that at the "memorial meeting" for Planck one should talk about Planck and not about one's own work.

Pauli writes to Heisenberg of his decision to withdraw from the publication of the pre print, as no longer agrees with essential parts of its contents.

Pauli writes of his definite decision not to publish together with Heisenberg paper "On the isospin group in the theory of elementary particles", because essential parts of the pre print cannot be backed by him. He says that free to publish the paper alone. He summarizes his own views: 1)out of the degeneracy of the vacuum the possibility of a half-integer difference between ordinary spin and isospin cannot be concluded. 2)The idea of unification of field for strange particles has failed. 3)The eigenvalue problem has not been solved. 4)The physical meaning of the indefinite metric has not been clarified.

Pauli acknowledges receipt of Heisenberg's manuscript and makes a few comments.

Pauli writes about the competition between Hulthén's theory Review of Modern Physics (1945), Vol. 17 and Wentzel's "strong coupling" case as explanation for neutron-proton scattering.

Pauli discusses "Part IV" of Heisenberg's S-matrix theory published in: Zeitschrift für Naturforschung: 1, 608.

Pauli thanks Hulthén for sending the French edition of Lagervist's work on the Lamb shift.

Pauli writes of the preparations for his trip to Europe and of Schein's artificial meson production reported at the New York meeting.

Pauli discusses Schwinger's modification, published in: Physical review: (1942), 61, 387, of the Rosenfeld-Moller meson exchange theory. He obtains equations for deuteron ground state and discusses the attempts to solve them, with applications to scattering and work in

Pauli invites Hulthén to contribute to the Bohr issue, published in: Review of Modern Physics: (1945), Vol. 17.