Källén writes on further doubts as regards the Heisenberg model.

Källén talks about certain results of his calculations on singular functions important for the analyticity properties of the n-fold expectation value.

Møller and Kristensen thank Pauli for his instructive letter. They answer the question he asked and give some details of their form factor theory.

Møller and Kristensen send notes from a colloquium on nonlocal theories. They relay as invitation from Bohr to visit Copenhagen for the CERN Study Group.

Møller and Kristensen reply to Pauli's letter and manuscript. They writes about details of the mathematical development of their theory, with special reference to the work of Claude Bloch.

Möller and Kristensen reply to Pauli's question about the polarization of the vacuum by an external meson field.

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

Mercier has prepared his contribution to the symposium of the Zürich congress.

Møller corrects errors in his paper (in: kgl. Danske Vid. Selsk. Skr., nat.-math. Afd. : 24 (1946) no. 19). He notes implications of the Jost-ter Haar calculation for Heitler integral equation and Heitler's response.

Møller asks if he should find lodgings for Pauli?