Letter 10246
Haeckel, E. P. A. to Darwin, C. R.
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Thanks CD for Climbing plants and Insectivorous plants.
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Discusses his research on phylogeny. Results described in "Die Gastrula und die Eifurchung der Tiere" [Jena. Z. Naturw. 9 (1875): 402–508].
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Describes newly discovered coral.