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Other valuable treatises and memoirs have been written by Strauch (1849), Jellett (1850), Otto Hesse (1857), Alfred Clebsch (1858), and Carll (1885), but perhaps the most important work of the century is that of Weierstrass.
Next to Liebig, famous professors at the university included the theologian Adolf von Harnack, the lawyer Rudolf von Jhering, the economist and statistician Etienne Laspeyres, the physicist Wilhelm Conrad Röntgen, the mathematicians Moritz Pasch and Alfred Clebsch, the gestalt psychologist Kurt Koffka, the philologist and archaeologist Friedrich Gottlieb Welcker, and the orientalist Eberhard Schrader.