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Nilsson encloses a photo of J R Rydberg.

Nilsson makes remarks on Rydberg's 1913 postulate of two new elements. He talks about the "wechselsatz' multiplet.

Pais makes some comments in connection with time-reversal.

About the English translation of W. Pauli's essay 'Der Einfluss archetypischer Vorstellungen auf die Bildung Naturwissenschaftlicher Theorien bei Kepler'. E. Panofsky recommends D. Sachs as translator.