"Bulmer promoted what we would call today 'central nervous system plasticity,' in describing how one sense could take over the duties of another. This is well illustrated in the frontispiece of this work, which is the first representation of bone conduction, illustrated by the person 'listening' to the cello with his teeth. The figure in the middle shows the effects of speech articulation by blowing smoke. At the bottom are four faces. 'The first head shows a man with the mouth not in the normal position but located in the middle of the nose (smell), meaning that he can taste through his nose. The second man lacks a nose, and his mouth is shifted to the area of his nasal root, meaning that he can smell through his mouth (taste). The third man is blind, however, in each auricle an eye is engraved, thus he is able to see with his ears. The man on the right has no ears, but he hears with the right eye which is shown by the engraver by an auricle replacing the eye" (Robert Ruben, Hear, Hear! Six Centuries of Otology [2002] No. 80). Reproduction of the engraved frontispiece from the Folger Shakespeare Library at this link. Digital facsimile of the 1648 edition lacking the frontispiece from Gallaudet University, Internet Archive at this link.