This on-line version of "On The Medusa of Leonardo da Vinci" by Percy Bysshe Shelley is edited by Melissa J. Sites and Neil Fraistat. The text is taken from Posthumous Poems of Percy Bysshe Shelley, edited by Mary W. Shelley (London: John and Henry L. Hunt, 1824), pages 139-40. Mary Shelley's transcription of the poem can be found in Bodleian MS Shelley adds. d.7, pp. 97-8, 100, reproduced in the Garland Bodleian Shelley Manuscripts, volume 2.