ERDMANN, Oττo Linné (1804-1869) a German chemist, was the son of Karl Gottfried Erdmann, the physician who introduced vaccination into Saxony He was born at Dresden April 11, 1804. In 1820 and the following year he attended the lectures of the medico-chirurgical academy at Dresden, and in 1822 he entered the university of Leipsic, where he remained three years, devoting himself princi pally to the study of chemistry. In 1824 he received the degree of doctor of philosophy, and in 1825 that of licentiate of chemistry. In 1827 he became extraordinary professor, and in 1830 ordinary professor, of chemistry at Leipsic, the duties of which office he continued to discharge till his death at Leipsic, 9th October 1869. At Leipsic Erdmann established a chemical laboratory, which became the model of many similar institutions in Europe. He is best known for his discoveries regarding the qualities of nickel, and of indigo and other dye stuffs. In 1828, in conjunction with Werther, he founded the Journal fur technische und ökonomische Chemie, and later the Journal für prachtische Chemie. He is also the author of Ueber das Nickel (1827); Lehrbuch der Chemie (1828); Grundriss der Waarcukunde (1833); and Ueber das studium der Chemie (1861).

ERDÉLYI, JÂxos (1814-1868), an Hungarian poet and author, was born in 1814 at Kapos, in the county of Ungvâr, and educated at the Protestant college, of Sârospatak. In 1833 he removed to Pesth, where, having attracted notice by his poetical talents, he was, in 1839, elected member of the Hungarian Academy of Sciences. His literary fame was much enhanced by his collection of Hungarian national poems and folk-tales, Magyar Népkoltesi Gyüjtemény, Népdalok es Mondak (Pesth, 1846-47). This work, published by the Kisfaludy Society, was supplemented by a dissertation upon Hungarian national poetry, afterwards partially translated into German by Stier (Berlin, 1851). Erdélyi also compiled for the Kisfaludy Society an extensive collection of Hungarian proverbs— Magyar Kozmonddsok konyve (Pesth, 1851),—and was for some time editor of the Szépirodalmi. Szemle (Review of Polite Literature). In 1848 he was appointed director of the national theatre at Pesth; but after 1849 he resided at his native town. He died on the 23rd January 1868. The most important recent work bearing his name is a collection of folk lore, published the year after his death, entitled Λ Nép Kolteszete. nepdalok, népmesek es koznιondasok (Pesth, 1869). This work contains 300 national songs, 19 folk-tales, and 7362 Hungarian proverbs.