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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.

Fierz comments on two papers by Huang, Yangr and Luttinger on the statistics of rigid spheres.

Fierz writes about a note by Kusaka, published in: Physical review: 60 (1941) 61, regarding the theory of the neutrino with spin 3/2.

Fierz gives a differential equation and the canonical description of its solution.

Fierz writes about Pauli's jocular remarks concerning parity.

Fierz makes historical comments on the parity problem and different attitudes towards the idea of symmetry and perfection in Kepler, Galileo, Newton and Leibniz.

Fierz explains further his considerations as regards the two component theory of the neutrino with special reference to Weyl's and Majorana's theories.