Christoph Friedrieh Nicolai, a German author, born in Berlin, March 18, 1733, died Jan. 8, 1811. His father was a bookseller, and at the age of 16 he was sent to Frankfort-on-the-Oder to learn the same occupation. He returned to Berlin in 1752, and in 1755 published a volume of "Letters" which gained him the intimacy of Lessing and Moses Mendelssohn, with whom he commenced in 1757 the Bibliothek der sclwnen Wissenschaften. In conjunction with Lessing he established in 1759 the Briefe, die neueste Literatur betreffend; and in 1765 he projected the Allgemeine deutsche Biblioihek, which he edited until it reached its 107th volume. In the latter part of his life Nicolai, in consequence of illness and depression of spirits, was haunted by phantoms which, as he imagined, even spoke to him; and when by the use of medicine these apparitions were dispelled, he reported to the philosophical society of Berlin a full account of the matter. His principal works are: Cliarahteristische Anekdoten von Friedrieh II (6 vols., Berlin, 1788-'92); Leben und Meinungen des Magisters Sebal-dus Notlianker (4th ed., Berlin, 1799); and Beschreibung einer Beise durch Deutschland und die Scliweiz (3d ed., 12 vols., Berlin, 1788-'96). Nicolai's Leben und sonderbare Meinungen, by Fichte, was edited by A. W. von Schlegel (Tubingen, 1801); and his biography and literary remains, by Gockingk, were published at Berlin in 1820.