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Dyson explains why the symmetrical treatment of the radiation field gives the right answer in Schwinger's theory. The letter contains information about experimental results of Powell on fast Pi-mesons and a discussion of the question longitudinal photons.

Dyson writes about Baranger's calculation of the relativistic correction to thesecond order lamb-shift. He adds to the letter his ideas about the renormalization programm.

Dyson sends more details about the renormalization method.

The letter contains Dyson's reply to Pauli's letter about the convergence problem, meson theories and renormalization and series expansion.

De Sitter makes remarks on Einstein's cosmology.

De Broglie's letter starts with an historical survey of the development of his idea of the pilotwave. After 1927 under the influence of Bohr's and Heisenberg's arguments, he joined their non-deterministic view. Now, after Bohm's work and and Vigier's comments on it, he returns to his former idea of a determinisitic interpretation of the wave function $\psi$.

Darwin replies to a letter by Pauli answering that of 20-11-1927 and he discusses several features of the Stern-Gerlach effect. He writes to Pauli about Dirac's equation which is just about to be published.

Darwin warns Pauli that his forthcoming paper in the proceedings of the Royal Society contains something of an attack on Pauli, as regards the spinning electron in free space.