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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.

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.

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