Letter 7839A
Darwin, C. R. to Darwin, Francis
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Cancelled: Now part of 7520a. Has visited Mivart.
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He seemed to have forgotten CD's argument regarding the formation of the greyhound.
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Discussed the larynx and the silence of the Cetaceans.
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If FD mentions any of this to [Marlborough Robert] Pryor, ask him not to mention it to anyone else "as it is perhaps rather a breach of confidence to repeat even to friends private conversation".