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Dear Sir
I regret to say that your question relates to a subject much too difficult & doubtful for me to attempt any answer in the compass of a note.2
ADraft
Please cite as “DCP-LETT-13264,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-13264
Regrets he cannot answer ELJ’s question in a note.
Darwin Correspondence Project[View Ɛpsilon collection]
Also published in The Correspondence of Charles Darwin, vol. 29.