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.

Fierz writes on the problem of leptonic charge.

Fierz sends some calculations with reference to Chandra's work on the infinitesimal Lorentz group.

Fierz writes on the symbolic significance of birds and on two physical description.