Introductory lecture to 'Materia medica'

Introductory lecture to 'materia medica', which Linnaeus taught at the University of Uppsala. Reference to Linnaeus's 1749 "Materia medica". In a letter to Bäck, Linnaeus mentions that he is teaching materia medica both publicly and privately: Carl Linnaeus to Abraham Bäck, 19 November 1754, "The Linnaean correspondence", linnaeus.c18.net, letter L1834