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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.

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 $\psi$.

De Shalit asks questions regarding the contents of the preprint: 1) How is half-integer spin and integer iso-spin derived for the $\Lambda^{0}$ and $\Sigma$ particles 2) the role of the neutrino in weak interactions 3) He makes remarks on the non-linear equation of motion.

De Sitter makes remarks on Einstein's cosmology.

Dürr's original letter was accompagnied by a copy of the preprint "Isospin group in the theory of elementary particles" by Heisenberg and Pauli. He added some remarks to the document.

Dürr clarifies certain points in his note concerning his remarks to Heisenberg's and Pauli's preprint.

This letter is a reply to Pauli's letter of 17-03-1958. Dürranswers to Pauli's six questions and writes about some corrections he made of his own paper.

Dürr's reply to pauli's letters of 24 and 26-03-1958 makes some suggestions for the improvement of his calculations.

Dyson writes about the renormailzed field theory and on Pauli's problem of "ghosts".

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.