Letter 7491
Crotch, G. R. to Darwin, C. R.
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Thanks for presentation copy of Descent.
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Mivart's Genesis of species [1871] is poor.
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Mathematical illustrations of Pangenesis at Cambridge.
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Wallace's address on Madeira not convincing ["The President's Address", Trans. R. Entomol. Soc. Lond. (1870): xliv–lxix; A. R. Wallace, Studies scientific and social (1900) 1: 250–66].