Commentary on the effects of electricity on muscular motion / Luigi Galvani ; translated into English by Margaret Glover Foley ; with notes and a critical introduction by I. Bernard Cohen ; together with a facsimile of Galvani's De viribus electricitatis in motu musculari commentarius (1791) and a bibliography of the editions and translations of Galvani's book prepared by John Farquhar Fulton and Madeline E. Stanton