Charles Bell's Bridgewater Treatise on the hand should be read as elaborating philosophies of pedagogy and the senses, and as fitting with Bell's work on the nervous system. In The Hand, Bell argues that sensory reception must be coupled with muscular action to establish true knowledge, elevating the 'doing' hand to epistemological parity with the long-superior 'seeing' eye. Knowledge in anatomy was typically couched in terms to do with sight and depiction; but according to Bell, anatomy simply could not teach the sort of feeling that one would encounter inside a living body. Instead, anatomy taught students to map the parts so that their fingers, moving through a surgical field, could 'see' and therefore could know and could act. This elevation of the status of the hand also had social implications that fit with Bell's reformist politics.