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Pauli talks about further discussion of the Bethe-Heitler formula. He comments on the hard component of the primary cosmic radiation.

Pauli writes on the problem of wave-quantization as the fundamental problem of physics. He is inclined to drop the idea of the existence of a universal length, because such an assumption cannot lead to finite energy values in a quantized wave theory. He talks about the interpretation of recent results of shower-measurements.

Pauli makes a short acknowledgement of Heisenberg's letter of the 12 March.

Pauli gives comments on a new manuscript by Heisenberg which is valued very positively by Pauli.

Pauli discusses the problem of scattering of mesons and protons. He talks about the preparation for the next Solvay congress.

Pauli talks about de Broglie's report for the Solvay congress on the theory of the photon. Pauli does not believe in de Broglie's hypothesis that the rest mass of the photon is different from zero.

Pauli writes more about form-factors. The analogon of the arbitrary cut between observed system and means of observation in field theory has yet to be found. Pauli thinks of some group-theoretical formulation by which the same physical object is either seen as source of the field or as produced field. He talks on ideas about the origin of life and its connection with the realization of low probabilities.

Pauli makes some remarks on Heisenberg's "Hilbert-space II", and replies to Heisenberg's criticism of Landeau's work.

Pauli comments on Heisenberg's formulation of field quantization and some questions on specified points.