Very different the career of the great author of the _Mithridates_, John Christopher Adelung, who lived almost exclusively for learning. He was born in 1734, at Spantekow in Pomerania. In 1759, he was appointed to a professorship at Erfurt; but he exchanged it, after a few years, for a place at Leipsic, where he continued to reside for a long series of years. Although habitually of a gay and cheerful disposition, and a most agreeable member of society, he was one of the most assiduous students upon record, devoting as a rule no less than fourteen hours a day to his literary occupations.[146] His services to his native language are still gratefully acknowledged by every German etymologist, and his Dictionary, (although since much improved by Voss and Campe,) has been declared as great a boon to Germany, as the united labours of the Academy had been able to offer to France. Adelung’s personal reputation as a linguist was exceedingly high, but his fame with posterity must rest on his great work, the _Mithridates_, which I have already briefly described. The very origination of such a work, or at least the undertaking it upon the scale on which he has carried it out, would have made the reputation of an ordinary man. In the touching preface of the first volume, (the only one which Adelung lived to see published,) he describes it as “the youngest and probably the last child of his muse;” and confesses that “he has nurtured, dressed, and cherished it, with all the tenderness which it is commonly the lot of the youngest child to enjoy.”[147] It is indeed a work of extraordinary labour, and, although from the manner in which its materials were supplied, necessarily incomplete and even inaccurate in its details, a work of extraordinary ability. The first volume alone (containing the languages of Asia, and published in 1806,) is exclusively Adelung’s. Of the second, only a hundred and fifty pages had been printed when the venerable author died in his seventy-third year. These printed sheets, and the papers which he had collected for the subsequent volumes, he bequeathed to Dr. Severinus Vater, professor of theology at Königsberg, under whose editorship, with assistance from several friends, (and especially from the lamented William von Humboldt and Frederic Adelung,) the second volume, which comprises the languages of Europe with all their ramifications, appeared in 1809. The third, on the languages of Africa, and of America, (for which last the work is indebted to Humboldt,) appeared, in parts, between 1812 and 1816; and a supplementary volume, containing additions to the earlier portions of the work, by Humboldt, Frederic Adelung, and Vater himself, was published in 1817. It is impossible to overstate the importance and value of this great linguistic repertory. The arrangement of the work is strictly scientific, according to the views then current. The geographical distribution, the origin and history, and the general structural peculiarities of each,