DARWIN, CHARLES. (1809-82). British scientist and founder of evolutionary theory. Manuscript Note Boldly Signed: “Ch. Darwin / [Down – written in Emma’s hand] / Oct[ober] 17”, no year. [but 1871 — from postal cancelations]. Penned on the verso of an imprinted UK 1/2 penny Postcard. Addressed to: “E[dward] Bartlett, 70 Delancey Street, Regent’s Park, N.W. [London]”. Postal cancellations for London and Beckenham and a D13 Oval cancellation over postage imprint on recto. The text of the note is in the hand of Darwin’s wife, Emma. The note reads: “I am greatly obliged for your note received this morning”. At this time the correspondence between Darwin and Bartlett concerned Egyptian geese, and how they feed while their heads are under water. Very fine condition, and a fine, relatively inexpensive example of his signature.