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Papers of Robert Horton, early 19th century, comprising a manuscript volume titled Anatomy Notebook, Horton containing notes on subjects such the central nervous system, bones, joints, ligaments, blood vessels, testicles, brain, ear, eye and heart. The volume is undated but there is a watermark of 1818. In addition, on page 103, Horton mentions the discovery of a membrane in the eye by Dr Jacob. Jacobs Membrane, a layer of the retina containing rods and cones was first described in 1819 by Irish Opthalmic surgeon Arthur Jacobs (1790-1874). Therefore the volume can be dated to after 1819, and was probably written in the early 19th century.