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Letter 8669

Haeckel, E. P. A. to Darwin, C. R.

10 Dec 1872

    Summary Add

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    Thanks CD for Expression.

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    Describes work on Die Kalkschwämme and its principal conclusions.

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    The application of biogenetic law.

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    Notes variability among calcareous sponges.

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    Gastrula-like "Gastraea" as ancestor of multicellular animals.

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    Posits homology between Hydra, Olynthus of calcareous sponges, and initial germ layers of higher animals.

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    Comments on Lubbock's Prehistoric times [1865]

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    and on David Strauss's Der alte und der neue Glaube [1872].

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