In honor of Darwin Day: An interior page on natural selection in an unopened original of the Proceedings of the Linnean Society. Note that the octavos in the edition haven’t been cut accounting for the top of the page being curved in the picture (because of the attachment of the adjoining pages). Science changed dramatically that day.
Incidentally, the original price of this copy was 2 Shillings and the estimated market value when I took this photo in 2010 was $75,000!