Pauli letter collection: letter to Wolfgang Pauli

Heisenberg agrees with Pauli's calculations on the spinning electron in his last letter. He writes about Dirac's generalization of the transformation function S, and its physical content. He thinks that Dirac's work is a very great step forward. He writes also about Hund's work on H$\p2$, two calculations by Sugiura, on the number of dispersion electrons in Na, and on the continuous spectra of H.