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Pauli makes some remarks on Dirac's theory, particularly on the problem of low-frequency photons.

Pauli quotes and comments parts of a letter of Eliezer. He also writes about a letter of Heitler whose method leads in the case of meson-fields to different results from those made by Dirac. He mentions two papers by Heisenberg and comments on his unitary S-matrix.

Pauli writes of another letter of Eliezer and encloses a copy of his answer to him and he adds some remarks.

Pauli thinks that his new formulation of quantum electrodynamics represents a progress, although he agrees with Dirac that a greater symmetry between space-variables and time-variables seems desirable.

Pauli asks Dirac to help a young jewish cousin of his who was forced to leave Austria for racial reaons and is now in danger to be expelled from Switzerland. He writes about his recent investigations with Fierz on particles with an arbitrary spin. He asks if they could be published in the Proc. Roy. Soc. He makes some remarks on Dirac's paper on the theory of the electron.

Pauli makes a short remark on the application of quantum-mechanical formalism to classical theories.

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

Pauli thanks for a paper sent in honour of Bohr's 60th birthday. He cannot accept Dirac's theory from the standpoint of physics because it leads to results contradicting the required correspondence to the classical theory.

Pauli expresses his dissatisfaction over Dorac's remarks in the Proc. R. S. on Heisenberg's and pauli's papers on quantum electrodynamics. He particularly argues against Dirac's doubts as to the relativistic and the invariance of quan tum electrodynamics.

Pauli thanks Dirac for his readiness to help Pauli's jewish cousin in getting a British visa.