Lüders makes more calculations on the neutrino field.

Lüders writes about the necessary and sufficient conditions for the conservation of lepton-charge.

Lüders gives more details about the identities between the invariants in the neutrino theory with conservation of lepton-charge.

Lüders makes comments on Pauli's relative invariants. (Reply to Pauli's letter of 16 July).

Lüders makes calculations on the problem of invariants in the $\mu$- e- disintegration, in connection with Gatto's work.

Lüders writes about his investigations on the commutation-relations between different fields.

Lüders replies to Pauli's letter of 14 May concerning indefinite metric.

Lüders agrees with Pauli about the necessity of including Schwinger's name in the co-authorship of their invariance theorem. He talks about his work with Zumino on TCP-invariance.

Addition to Lüders' letter of 6 Feb, about the authorship of the TPC-theorem.

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.