The extensive and miscellaneous division which succeeds may, perhaps, best be defined under the head of Philosophy, alike in its scientific principles and in its application to human life. Commencing with Political Philosophy, or the Science of Government, it runs rapidly through the politics of the various nations, in the geographical order previously detailed, passes into Political Economy, with the allied subjects of Finance, Commerce, and Social Science; thence into Education, and, by the minor morals so intimately allied with the latter subject, into Ethics, including works on the condition of Woman, Peace, Temperance, and similar topics. Speculative Philosophy succeeds, introducing Mathematics, on which hangs the great department of Applied Mathematics, including all physical sciences except the biological. The various branches are carefully discriminated, and room is found among them for the so-called Occult Sciences, and for Military and Naval matters, the series appropriately concluding with Chemistry, or the science which aims at the resolution of all matter into its original elements. The remaining sections, though most important and extensive, are very simple in arrangement, and may be dismissed very briefly. They are: History; Geography, with Voyages and Topography; Biography; Poetry and the Drama; Belles Lettres, including Fiction; and Philology. The arrangement is invariably the same: collected works on each subject being placed first, and a geographical order being adopted for the rest when the conditions of the case allow. Genealogy is regarded as an appendix to History; Letters to Biography; Elocution, with Literary Criticism and Bibliography, to Poetry and the Dramatic Art. The class of Belles Lettres is headed by Libraries and Cyclopædias. It should be stated that the system here explained refers in the strictest sense only to works complete in themselves, and not to Periodicals, Academical Publications, and State Papers, which are placed separately. Although, however, these constitute distinct series, the principle of classification is practically identical. The same remarks apply to the Oriental departments of the collection, the Grenville library, and the reference-library of the reading-room.