 He then went to Göttingen, where he published the results of his galvanic inquiries in "Ueber thierische Electricität und Reizbarkeit" (“On animal electricity and susceptibility to stimulus”).In 1797 he became an associate professor at the University of Kiel, and in 1802 was made professor of chemistry, physics and medicine there with rank at the same time as a member of the medical faculty.He then directed his attention particularly to pharmaceutical chemistry, and was thus led to the composition of his most important work, "System der Materia Medica nach chemischen Principien" (“System of materia medica using chemical principles,” 1808-24).