Pauli asks questions about the possibility of eliminating the concept of Lagrangian and the corresponding field equations from the formalism of quantized fields. He also writes about corresponding invariants.

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 makes mathematical remarks about the particles resulting from a spinor model. He writes on the electrodynamical aspect of his calculations. He is against the publicity given by Heisenberg to his "world-formula".

Heisenberg makes some additional comments on the last results. He resents the letter of Laue about the publicity given to the work. (The letter was sent to him by Pauli.)

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 sends a circular letter concerning Heisenberg's paper on isospin. He explains why he withdrew his participation in Heisenberg's publication.