This man was Michael Heilprin (b. in Piotrkow, Russian-Poland, 1823; d. in Summit, N. J., 1888), the son of Pinhas Mendel Heilprin (b. in Lublin, Russian-Poland, 1801; d. in Washington, D. C., 1863). His father, who was a scholarly merchant of the old Polish-Jewish type and the author of several works in Hebrew, was his only teacher, and brought him up in that spirit of enlightened Orthodoxy which was not antagonistic to the acquisition of secular learning. Michael’s almost phenomenal memory and diligence helped him to master many languages and to become proficient in numerous sciences, which enabled him later to become one of the associate editors and an important contributor to _Appleton’s New American Cyclopaedia_. The Heilprins removed to Northern Hungary about 1843, where Michael established himself as a bookseller in Miskolcz. He soon mastered the Hungarian language, and his articles and poems in the cause of liberty attracted much attention during the stormy days of 1848 and 1849. He became the friend and confidant of Louis Kossuth (1802–94) and other leaders, and when the short-lived independent Hungarian government was established, he became secretary of the literary bureau which was attached to its ministry of the interior. After the suppression of the Revolution he spent some time in Cracow and in France, but returned to Hungary in 1850, and settled as a teacher in Satoralja-Ujhely, where his second son, the well-known American naturalist, Angelo Heilprin, was born in 1853 (d. in New York, 1907); the elder son, Louis, the encyclopedist (b. in Miskolcz, 1851), died in New York in 1912. Michael Heilprin came to the United States in 1856 and settled in Philadelphia, where for two years he taught in the schools of the Hebrew Education Society. He “saw but one struggle here and in Hungary,” and his sympathies were actively engaged in the anti-slavery movement. In 1858 he settled in Brooklyn, where he resided until 1863, when he removed to Washington, returning to New York in 1865. On January 16, 1861, he contributed a fiery denunciation and an exhaustive scholarly refutation of Raphall’s views to the _New York Tribune_ which commanded wide attention; and owing to this vehement but convincing repudiation of alleged Jewish pro-slavery views, Heilprin succeeded in arousing the public in a more marked degree than any other Jewish anti-slavery champion.