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.

De Sitter makes remarks on Einstein's cosmology.

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 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 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.

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.

Corson writes about his plans for a trip to Europe and of his visit to Pauli in Zürich and to Heisenberg in Münich.

Corson announces his visit to Europe in Spring 1959. He asks for Pauli's opinion on Heisenberg's non-linear field theory.