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About Bohr's and Rosenfeld's work on measurability and Heisenberg's calculations.

Bohr discusses Goudsmit and Uhlenbeck's work published in: Nature : 117 (1926), pp.264. Thomas has explained the missing factor of 2 by calculating the relativistic motion in: Nature : 117 (1926), pp.514. Thomas' note is enclosed.

Bohr is convinced of the significance of Thomas' paper in : "Nature : 117 (1926), pp. 514" and asks for a reply to his questions before reading the proofs of Thomas' paper. He also hopes to see Pauli in Copenhagen in April.

Bohr agrees with Pauli and Jordan's attitude in their note on quantum electrodynamics. The apparently contradictory demands of superposition and individuality concern not opposing but complementary aspects of nature. Bohr also agrees with Pauli's criticism of de Broglie's work. Bohr has not been able to finish his note and is now working on his Como lecture in: Nat. suppl. : 121 (1928), pp .580 and in: Naturwissenschaften : 16 (1928)". He looks forward to see Pauli in Como.

This letter encloses a manuscript by Darwin. Bohr looks forward to meeting Pauli in Como.

About a manuscript in progress by Bohr and Rosenfeld on "measure problems", Pauli's remarks on a manuscript of a conference by Bohr during the Solvay congress, works on atom structure published in the 'Physical Review'.

Bohr comments on a book by A Pauly (1905) on "Darwinism and Lamarchism". Bohr gives his attitude to the great progress in biology and psychology made in recent time, in the light of the results of atomic physics as regards the description of phenomene.

About Wolfgang Pauli's death.

Born accepts an invitation to a symposium. He hopes to enter his new house in Pyrmont in ten days. He writes on his ideas about an indeterministic, statistical formulation of classical mechanics and the transition from the individual state to a statistical equilibrium. He writes of his impending honorary doctorate in Oxford.

Born replies to a letter from Pauli and gives a clarification of his and Pauli's divergent views as regards the statistical theory of irreversible processes.