Influential German evolutionist, morphologist, and developmental biologist (1834-1919). ALS in German, signed “E. Haeckel,” one page on a 5.25 x 3.5 postcard, March 4, 1887. Untranslated handwritten letter from Jerusalem, sent to Dr. Ernst Krause in Berlin. In fine condition, with light soiling and a rusty circular paperclip impression to the top.
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