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Historical remarks from Klein about Poincaré's note in "Comptes Rendus 146" and in "the origins of relativity".

Klein's reply to Pauli's letter of 4 May, and detailed comments on several passages in the encyclopedia.

Schrödinger thanks for sending him a copy of his "encyclopädie-artikel". He is very pleased with the didactic arrangement of the material. He writes about geodetic lines and charged particles.