The THEORY of the LONG INEQUALITY of URANUS and NEPTUNE, depending on the near Commensurability of their Mean Motions. An Essay. By R. PEIRSON, M.A., Fellow of St. John's College. 6s.

A SERIES of FIGURES illustrative of GEOMETRICAL OPTICS, reduced from Steel Engravings executed by F. Engel, under the direction of Professor K. Schellbach, of Berlin; together with an Explanation, forming a Treatise, translated from the German of Professor Schellbach. The whole Edited, with Notes and an Appendix, by W. B. HOPKINS, M.A., Fellow and Tutor of St. Catharine's Hall, and formerly Fellow and Mathematical Lecturer of Gonville and Caius College, Cambridge. Demy folio, 10s. 6d.

SOLID GEOMETRY, a Treatise on the Application of Analysis to. Commenced by D. F. GREGORY, M.A., late Fellow and Assistant Tutor of Trinity College, Cambridge: concluded by W. WALTON, M.A., Trinity College, Cambridge. Second Edition, revised and corrected. 8vo. 12s.

ELEMENTARY MECHANICS: designed chiefly for the Use of Schools. Part I. STATICS. By HARVEY GOODWIN, M.A., late Fellow and Mathematical Lecturer of Gonville and Caius College. Price 6s.

Cambridge: JOHN DEIGHTON.

London: GEORGE BELL; and SIMPKIN, MARSHALL, & CO.

FOLIORUM SILVULA: Selections for Translation into LATIN and GREEK VERSE, chiefly from the University and College Examination Papers. By the Rev. HUBERT ASHTON HOLDEN, M.A., Fellow and Assistant Tutor of Trinity College, Editor of "Aristophanes." 8vo. Price 7s.

FOLIORUM CENTURIÆ: Selections for Translation into LATIN and GREEK PROSE, chiefly from the University and College Examination Papers. By the Rev. HUBERT ASHTON HOLDEN, M.A., Fellow and Classical Lecturer of Trinity College, Editor of "Aristophanes." 8vo. Price 7s.

Cambridge: JOHN DEIGHTON.

London: GEORGE BELL, Fleet Street.