German botanist (1839-1887) who developed a new system of classification of plants to reflect the concept of evolution. ALS in German, signed “A. W. Eichler,” one page, 5.5 x 8.5, Martius' Flora Brasiliensis letterhead, August 14, 1869. Untranslated handwritten letter to English botanist and taxonomist Maxwell T. Masters. In very good to fine condition, with a rusty circular paperclip impression to the top and several pencil notations to the text.
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