Rayski sends another derivation of the commutation relations for a non-local theory, based on methods described by Schwinger.

Reichenbach refers to Pauli's article on hidden parameters. He expresses satisfaction at Pauli's strong rejection of this idea. He comments on the method of his argument against it.

Rosenfeld thanks Pauli for the letter and the typescript of Pauli's article on hidden parameters. He agrees with him and talks of his own article where the discussion of the problem will be put on philosophical ground.

Rosenfeld talks about Pauli's contribution to the forthcoming Bohr Festschrift.

Rzewuski refers to Pauli's paper "on the Hamiltonian structure of non-local field theories". He says that Pauli's conservation laws are particular cases of the general laws decrived by him (in: Nuovo Cimento : 10 (1953), pp.182).

Rzewuski sends a reprint on "differential structure of non-local theories".

Rzewuski encloses a note concerning conservation laws for non-local field theories.

Salam replies to Pauli's remarks about C, P or T conservation. He writes about some possible forms of writing down the $\beta$-decay interaction.

Salam writes about Pauli's criticisms of his note. He writes about the revivial of the neutrino theory of light.

Salam makes some corrections to his letter of 13 February 1957.