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Fierz writes about the results of his calculations on the unitary Lorentz-transformations.

Fierz agrees to participate on the symposium on "Phenomenon and physical reality". He describes his interpretation of the concepts of "phenomenon" and "reality", and relates this to the present situation of physics.

Fierz gives the solution of an equation connected with the problem of an orthogonal group.

Fierz makes some remarks concerning the theory of supraconductivity.

Fierz argues against Jordan's theory of gravitation, makes remarks on an anticipation of Mach's principle by Euler, and comments on Pauli's lecture in mainz.

Fierz makes some remarks on some recent papers about weak interactions.

Fierz sends some corrections to a first letter he had written on the same day (see letter fierz_0016-283r).

Fierz replies to a letter by Pauli and makes some remarks on the $\beta$-decay. Fierz sent another letter on the same day including some corrections to this one (see letter fierz_0016-282r).

Fierz makes further remarks concerning a paper by Stückelberg.

Fierz makes some general comments on the parity problem.