Nobel Prize–winning German physicist (1858–1947) who pioneered the understanding of quantum theory. TLS in German, signed “Planck,” one page, 8.25 x 11.75, President of the Kaiser Wilhelm Society letterhead, February 7, 1936. Untranslated letter to Professor Califano at the Stazione Zoologica in Naples, thanking him for a lengthy article marking the 25th anniversary of the Kaiser Wilhelm Society, and reiterating the importance of maintaining international scientific relations. In fine condition, with central vertical and horizontal folds. Accompanied by the original mailing envelope. Pre-certified PSA/DNA.
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