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Addition to Lüders' letter of 17 June.

Lüders writes about the point of the $\beta$-disintegration problem, still to be cleared, with reference to calculations by Gatto.

Lüders reports that no exchange relations were overlooked in Pauli's lecture.

Lüders corrects his letter of 16.12.57 : Pauli did overlook an exchange relation; Lüders lists all possibilities.

Lorentz invites Pauli to the Solvay-congress (24-29 Oct.). He gives the names of the participants and says that the subject for discussion is the new quantum mechanics.

Lopes writes about the derivation of the interaction operators by the perturbation method, with special reference to Schwinger's results.

Lopes replies to Pauli's letter of 25 July, with special reference to two questions put by Pauli : 1) Use of the angular momentum integral for the reduction of the rigorous wave equations. 2) The problem of an additional term giving a contribution to the quadrupol moment.

Lopes reports on his investigation of the scattering of fast netrons by protons in the strong coupling meson theory.

Lopes writes about the interaction energy of two heavy particles in the pseudoscalar meson theory, with reference to calculations by Kemmer.

Lopes reports on his investigation of the angular distribution of high energy neutrons by protons in the pseudoscalar theory with a strong coupling.