Landé asks for references to Pauli's earlier work on classical electrodynamics. He makes a progress report on his "eigenvalue theory".

Landé defines the meaning of a "filter" in his work. He distinguishes it from a potential barrier.

Landé sends manuscript "the ratio of e, c and h" and scattering diagrams invented by Thomas. He discusses the results comparing with them Dirac's theory.

Yang and Lee discuss several questions: 1) Lorentz invariance in weak interaction, 2) A test of CTP invariance proposed by Wightman, 3) The possibility of measuring the $\mu$ magnetic moment which will afford a test of quantum electrodynamics, 4) The Hamiltonian $\mu$ decay.

Lehmann, Symanzik and Zimmermann reply to Pauli's letter, in particular about Lee's model and the appearance of "ghosts".

Lehmann makes some remarks about the meson theory and the work of Dyson and Dalitz connected with it.

Lichnerowicz refers to the paper of Pauli and Einstein in Annals of Mathematics 1943 ("On the non-existence of regular stationary solutions of relativistic field equations"), and points out that in 1938 and 1939 he has developed a theorem nearly identical with that indicated by Pauli.

Lichnerowicz reply to Pauli's letter of 21 Sept. He explains in detail his hypothesis which Pauli finds "very unnatural".

Lichnerowicz reply to Pauli's letter of 15 Nov which has crossed his letter. Pauli's formula is identical to that of Lichnerowicz. He has solved the problem which interests them both and hopes that Pauli will agree to publish a note on it together with him.

Lichnerowicz sends offprints of his recent papers, especially one on the integration of Einstein's equations. He compares his results with those of Pauli's paper in the Annals of Math.