Influential German evolutionist, morphologist, and developmental biologist (1834-1919) remembered as a supporter and exponent of Charles Darwin's theories. AQS on a 5.5 x 3.75 postcard depicting a mountain in Jena, addressed by Haeckel to the publisher Philipp Reclam jun, February 25, 1916. Haeckel pens a quote in Latin: "'Universum perpetuum mobile,' Ernst Haeckel, ('Welträtsel,' Kap. 13)." In fine condition.
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