To Asa Gray   8 July [1872]

Letter and/or further information available at https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-8402.xml.

Also published in The Correspondence of Charles Darwin, vol. 20.

Please cite as “DCP-LETT-8402,” in Ɛpsilon: The Charles Darwin Collection accessed on 28 March 2024, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-8402