Samuel Thomas von Sömmerring originally published a clear, accurate and precise system in German (1791–1796), then in Latin (1794–1800). There was a second German edition in 1800–1801 and a further eight-volume edition (1841–1844) revised and with additional material by Th.L.W. Bischoff, Friedrich Gustav Jakob Henle, E.H. Huschke, Theile, G.G. Valentin, Vogel, and Rudolph Wagner. The arrangement of the edition is: