From Theodor von Heldreich   2 August 1877

Letter and/or further information available at https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-11091.xml.

Also published in The Correspondence of Charles Darwin, vol. 25.

Please cite as “DCP-LETT-11091,” in Ɛpsilon: The Charles Darwin Collection accessed on 28 April 2024, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-11091