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 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.

Bohr has gone through Pauli's "beautiful calculation" on the hydrogen spectrum published in: Zs. Phys. : 36 (1926), pp.336 written with Kramers and Kronig. He will arrange to see Pauli on his return from Leiden.

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