Letter 7268
Haeckel, E. P. A. to Darwin, C. R.
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Discusses applicability of evolutionary theory to the question of human origins.
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Describes revisions in 2d edition of Natürliche Schöpfungsgeschichte.
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His research on calcareous sponges.
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Mentions evolutionary content in Gegenbaur's Vergleichende Anatomie [2d ed. (1870)].