Of a widely different school of thought was Sir William Hamilton, Professor of Logic and Metaphysics in Edinburgh from 1836 to his death. Hamilton was a man of vast reading, and though it has been questioned whether his learning was as exact and profound as it appeared to be, there can hardly be a doubt that it was great enough to hamper the free play of his thought, and that it explains two of his characteristic faults. One is the excessive technicality of his diction. His style, otherwise clear and good, is overloaded with words specially coined for the purposes of the logician and metaphysician. The second fault is his inability to resist the temptation of calling a 'cloud of witnesses,' without making any serious attempt to weigh their evidence. Hamilton was a disciple of the Scottish school of philosophy, and a great part of his life was devoted to an elucidation of Reid, of whose works he published an elaborate edition in 1853. But Reid's principle of Common Sense, as an answer to the philosophic scepticism of Hume, is little better than an evasion; and Hamilton had not much to add to it. Besides the edition of Reid Hamilton published _Discussions on Philosophy and Literature_ (1852); and after his death there appeared the _Lectures on Metaphysics and Logic_ (1859-1861), by which he is best known. [Sidenote: James Frederick Ferrier (1808-1864).] Hamilton had a great and not altogether a wholesome influence on James Frederick Ferrier, who in the domain of purely metaphysical thought was probably the most gifted man of his time. Ferrier describes his own philosophy as Scotch to the core. There is in it, nevertheless, a considerable tincture from the German, and Ferrier deserves the credit of being one of the earliest professional philosophers who really grappled with German thought. He was also the master of a very clear and attractive style, which makes the reading of his philosophy a pleasure rather than a toil. [Sidenote: Henry Longueville Mansel (1820-1871).] Henry Longueville Mansel, a pupil of Hamilton's, and joint editor of his lectures along with John Veitch, afterwards Professor of Logic in Glasgow University, was the ablest exponent of the Hamiltonian philosophy in England. Mansel's power of acute and lucid reasoning was shown in his _Prolegomena Logica_ (1851), and afterwards in his _Philosophy of the Conditioned_ (1866). Both were developments of Hamilton's principles, and they have suffered from the general discredit of the Hamiltonian school. Mansel is better known now, by name at least, on account of his _Limits of Religious Thought_, (constituting the Bampton lectures for 1858), which was the occasion of a controversy between him and Maurice. [Sidenote: Harriet Martineau (1802-1876).]