Karol Libelt, a Polish author, born in Po-sen, April 8, 1807. He took the university prize at Berlin for a Latin essay on pantheism, and graduated there in 1829. Having visited Paris, he went to Poland on the breaking out of the revolution in Warsaw, and entered the national army as an artillerist. After the fall of Warsaw (1831) he returned to Posen, and devoted himself to agriculture. In 1840 he became an editor of the Tygodnik literacki (" The Literary Weekly"). Subsequently he took editorial charge of the Rok (" The Year "), and by means of this journal became the leading promoter of literary activity in the grand duchy. In 1846 he was arrested, with several others, on charge of treason, and imprisoned in Berlin, but was released at the revolution of 1848. He was subsequently one of the national committee in Posen, and was elected to the Slavic congress at Prague, to the second Prussian chamber, and to the German national assembly at Frankfort. He founded at Posen in 1849 a democratic journal entitled Dziennik polski, which was suppressed within a year. Since 1859 he has been a member of the Prussian house of delegates, and a leader of the Polish party.

He has published in Polish or German a number of works on mathematics, philosophy, and rural economy, including Wyklad matematykii ("Course of Mathematics," 2 vols., Posen, 1844); Filo-zofia i krytyka (5 vols., 1845-50); Dziewica orleanska (" The Maid of Orleans," 1847); a work on ethics entitled Umnictwo (1849); and Estetyka ("AEsthetics," 3 vols., 1851).