ALS signed “C. Darwin,” one page, 4.5 x 6, April 14 [no year]. Darwin writes to an unknown gentleman. In full: “Many thanks for the advertisement. I am much pleased that you are content with the title.” In very good condition, with letter partially affixed to same-sized sheet of paper, scattered soiling and a few light spots, and a few folds and wrinkles. COA John Reznikoff/PSA/DNA and R&R COA.