KOPP

kopp, hermann franz moritz (1817-1892), german chemist, was born on the 30th of october 1817 at hanau, where his father, johann heinrich kopp (1777-1858), a physician, was professor of chemistry, physics and natural history at the lyceum. after attending the gymnasium of his native town, he studied at marburg and heidelberg, and then, attracted by the fame of liebig, went in 1839 to giessen, where he became a _privatdozent_ in 1841, and professor of chemistry twelve years later. in 1864 he was called to heidelberg in the same capacity, and he remained there till his death on the 20th of february 1892. kopp devoted himself especially to physico-chemical inquiries, and in the history of chemical theory his name is associated with several of the most important correlations of the physical properties of substances with their chemical constitution. much of his work was concerned with specific volumes, the conception of which he set forth in a paper published when he was only twenty-two years of age; and the principles he established have formed the basis of subsequent investigations in that subject, although his results have in some cases undergone modification. another question to which he gave much attention was the connexion of the boiling-point of compounds, organic ones in particular, with their composition. in addition to these and other laborious researches, kopp was a prolific writer. in 1843-1847 he published a comprehensive _history of chemistry_, in four volumes, to which three supplements were added in 1869-1875. the _development of chemistry in recent times_ appeared in 1871-1874, and in 1886 he published a work in two volumes on _alchemy in ancient and modern times_. in addition he wrote (1863) on theoretical and physical chemistry for the graham-otto _lehrbuch der chemie_, and for many years assisted liebig in editing the _annalen der chemie_ and the _jahresbericht_. he must not be confused with emil kopp (1817-1875), who, born at warselnheim, alsace, became in 1847 professor of toxicology and chemistry at the ecole superieure de pharmacie at strasburg, in 1849 professor of physics and chemistry at lausanne, in 1852 chemist to a turkey-red factory near manchester, in 1868 professor of technology at turin, and finally, in 1871, professor of technical chemistry at the polytechnic of zurich, where he died in 1875. koprulu, or kuprili (bulgarian _valesa_, greek _velissa_), a town of macedonia, european turkey, in the vilayet of salonica, situated 600 ft. above sea-level, on the river vardar, and on the salonica-mitrovitza railway, 25 m. s.e. of uskub. pop. (1905), about 22,000. koprulu has a flourishing trade in silk; maize and mulberries are cultivated in the neighbourhood. the greek and bulgarian names of the town may be corrupt forms of the ancient bylazora, described by polybius as the chief city of paeonia.