Letter 10375
Haeckel, E. P. A. to Darwin, C. R.
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Thanks CD for comments on Arabische Korallen [1876].
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Comments on Monoenia darwinii [?] as a primitive sponge.
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Discusses criticisms of CD's theory by K. E. von Baer ["Über Darwin's Lehre", in Reden 2 (1876): 235–480].