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Fierz defends his position that entropy is the "measure of information" obtained by an observer. He examines information obtained in classical theory from observation of changing macrostate; in quantum theory from observation of microstate that is then generalized to a macrostate. He claims entropy exists only with observation.

Fierz gives a detailed description of Henry More's philosophy and theology with several quotations.

Fierz discusses the question of which representations of the homogeneous group can be contained in the inhomogeneous Lorentz group.

Fierz' letter concerns the interpretation of a passage in the Timaios. He quotes the passage in Ficino's Latin translation.

Fierz is against the conception that the origins of life are due to a "chance". He agrees with Pauli that one can expect to find spherical gravitational waves.

Fierz sends some additions to his letter of the 29th September 1954 (fierz_0016-15r).

A sketch of a statistical theory of a dust particle.

Fierz makes a detailed critical analysis of Weizsäcker's paper in "Die Naturwissenschaft". He rejects in particular Weizsäcker's suggestion of a modified logic for the explanation of the dualism wave-particle.

Fierz writes of his talk with Bohr about Weizsäcker's 'quantum-logic" and of Bohr's rejection of it.

Fierz makes some remarks about the $\beta$-decay and the properties of the neutrino and the anti-neutrino.