French-Swiss botanist (1806-1893) who developed the laws of botanical nomenclature. ALS in French, signed “Alph. de Candolle,” three pages on two adjoining sheets, 5.25 x 8, December 20, 1874. Untranslated handwritten letter regarding the publication of a monograph, with reference to "l'evolution d'organes." In fine condition, with the bottom portion of the second leaf torn away.
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