Pauli writes of a letter by de Broglie clarifying the point of view published in: J. Phys. : 8 (1927), pp.225. He also criticizes a recent publication by de Broglie dealing with the Schrödinger equation.

Pauli refers to a paper by Weisskopf concerning the self-energy of the electron, which might be useful to Dirac on his discussion of the logarythmic infinities in the theory of holes. A copy of the paper is mailed to Dirac.

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 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.

Pauli gives further details concerning his jewish cousin.

Pauli's letter concerns his paper with Fierz on particles with arbitrary spin. He asks Dirac to communicate it to the Royal Society. the paper shows that a consistent theory of such particles in an electromagnetic field is possible.

This letter is Pauli's reply to Dyson's explanation on renormalization.