Lüders makes some comments on Pauli's letter of 18 April 1957 : 1)On the TCP-problem. 2)On Bell's paper. 3)On Klein's theorem. He writes more about his and Zumino's calculations on strong interactions.

Lüders makes remarks on Pauli's letter and preprint (6-6-57), with some calculations on the neutrino-field.

Lüders writes about the connection between the TCP-theorem and the question of spin and statistics.

Lüders thanks Pauli for his letter of 16 June and his offprints on field theories covariant with regard to the Lorentz group.

Lüders thanks Pauli for his comments on his work. He makes some remarks about details of Pauli's manuscript.

Lüders replies to Pauli's letter and makes objections to his remarks on the "gauge-group".

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.