From R. H. Wedgwood   [1871–82]1

I want to tell you of an instance of long memory in a horse. I have just driven my pony down from London here, and though she has not been here for eight years, she remembered her way quite well, and made a bolt for the stables where I used to keep her.2

The year range is conjectured from the assumption that the letter was inspired by CD’s work on the mental powers of animals, published in Descent in 1871. CD died in April 1882.
CD had discussed the instinctive behaviours and mental powers of animals, including horses, in Descent1: 34–106.

Please cite as “DCP-LETT-13855A,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-13855A