BACON, FRANCIS Sylva Sylvarum, or, A Natural History. In Ten Centuries. Together with The New Atlantis; a Work Unfinished. London: J.H. for William Lee, 1631.[10], 258, [8], [4], 48. 4to, contemporary mottled calf ruled in blind, rebacked and restored, retaining portions of original gilt-lettered spine, original placeholder ribbon, frontispiece portrait, engraved title page, engraved head-pieces. Third edition of Bacon's scientific experiments and observations in natural history, which he intended to be the final portion of his vast unfinished philosophical work, "Instauratio Magno." It was published posthumously a year after his death in 1627, with his incomplete utopian work, "New Atlantis," which has a separate title page. Corners bumped; bookplate John T. Aiton and "Book Searchers" sticker tipped to front pastedown; a few corners creased; some light staining to portrait and engraved title page and a few scattered brown stains, but otherwise internally clean; small manuscript notation to title page.