ALS signed “C. L. Darwin,” one page, 5 x 8, personal letterhead, October 24 [no year]. Darwin writes to an unknown gentleman. In full: “Pray thank Prof. Reichenbach for his great kindness. I am sorry that you & he have to trouble; for a plant at Kew was afterwards discovered in flower & was sent to me, so that I was able to examine much the doubtful point.” Accompanied by an unsigned reproduction photo. In fine condition, with mild toning, usual mailing folds, and some light scattered wrinkling. COA John Reznikoff/PSA/DNA and R&R COA.