“ In 1811 he was appointed professor of technology and mining, and afterwards of geology and mineralogy in the university of Göttingen, and this chair he occupied until a short time before his death. He was also for many years secretary of the Royal Academy of Sciences of Göttingen. He published observations on geology and mineralogy in Spain and Italy as well as in central and northern Europe: he wrote on gypsum, pyrites, felspar, tachylite, cordierite and on some eruptive rocks, and he devoted much attention to the crystals developed during metallurgical processes. ”