An enclosure other in English.
Offprint, in buff wrappers, of Charles Darwin and Alfred Russel Wallace's paper "On the tendency of species to form varieties; and on the perpetuation of varieties and species by natural means of selection." communicated by Sir Charles Lyell and Joseph D. Hooker to the LSL meeting of 1 July 1858. Published in the Journal of the Proceedings of the Linnean Society: Zoology, 3(9): 53-62 (20 Aug. 1858).
Pages with text: 19
Paper cover labelled in pencil [in Alfred Russel Wallace's or William Greenell Wallace's hand] "Species Darwin & Wallace"; text with correction and additions in Alfred Russel Wallace's hand in pencil and ink and a note on the back flyleaf in pencil in his hand, beginning "1860. Feb. | After reading Mr Darwin's admirable work "On the Origin of Species'?"