From Richard Lydekker   [after 26 November 1872]1

[Mr. R. Lydekker (letter n. d.) communicates a remarkable instance of an inherited peculiarity producing a characteristic drooping of the eyelids. The peculiarity is the paralysis, or, more probably, the absence, of the levator palpebræ.2 It first showed itself in a woman, Mrs. A.; she had three children, one of whom, B., inherited the peculiarity. B. had four children, all of whom were affected with the hereditary droop; one of these, a daughter, married and had two children, of whom the second showed the peculiarity, but on one side only.]

The date is established by the publication date of the first edition of Expression (Freeman 1977). A note about Lydekker’s letter was added to Expression 2d ed., edited by Francis Darwin and published in 1890.
The levator palpebrae superioris is the muscle that lifts the upper eyelid.

Please cite as “DCP-LETT-8649F,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-8649F