8vo, 2 vols.; 2nd edition, London, 1842, 8vo. 2. ‘An Examination of some Passages in Dr. Whateley's Elements of Logic,’ Oxford, 1829, 8vo. 3. ‘The History and Antiquities of the Doric Race … translated [from vols. ii. and iii. of K. O. Müller's ‘Geschichten Hellenischer Stämme und Städte’] by H. Tufnell and G. C. Lewis,’ Oxford, 1830, 8vo, 2 vols.; 2nd edition, London, 1839, 8vo, 2 vols. 4. ‘Remarks on the Use and Abuse of some Political Terms,’ London, 1832, 8vo; new edition, with notes and appendix by Sir R. K. Wilson, bart., Oxford, 1877, 8vo. 5. ‘An Essay on the Origin and Formation of the Romance Languages. Containing an Examination of M. Raynouard's Theory on the Relation of the Italian, Spanish, Provençal, and French to the Latin,’ &c., Oxford, 1835, 8vo; a new edition, London, 1839, 8vo; second edition, London, 1862, 8vo. 6. ‘On Local Disturbances in Ireland, and on the Irish Church Question,’ London, 1836, 8vo; the part relating to the ‘Irish Church Question’ is a revised edition of his article which appeared in the third number of the ‘London Review.’ 7. ‘A Glossary of Provincial Words used in Herefordshire and some of the adjoining Counties’ (anon.), London, 1839, 12mo. 8. ‘History of the Literature of Ancient Greece. By K. O. Müller, vols. i. and ii. pts. i–iv. [translated from the German manuscript by G. C. Lewis],’ London, 1840–2, 8vo; no more published by the Society for the Diffusion of Useful Knowledge, but the work was afterwards completed by J. W. Donaldson, D.D., London, 1858, 8vo, 3 vols. 9. ‘An Essay on the Government of Dependencies,’ London, 1841, 8vo; a new edition, Oxford, 1891. 10. ‘Babrii Fabulæ Æsopeæ cum Fabularum deperditarum Fragmentis. Recensuit et breviter illustravit G. C. Lewis,’ &c., Oxford, 1846, 12mo; 2nd pt., London, 1859, 8vo. The spurious fables in the second part were concocted by Minoides Menas, a Macedonian Greek, by whom they were sold, together with the manuscript of the genuine apologue, to the trustees of the British Museum in 1857. ‘To the eternal disgrace of English scholarship’ they were edited by Lewis in 1859, but were ‘almost immediately exposed by Duebner, Cobet, and other scholars’ (W. G. Rutherford, Babrius, 1883, p. lxix). Both parts were translated into English verse from Lewis's text by the Rev. James Davies, who dedicated the translation to Lewis, London, 1860, 8vo. 11. ‘An Essay on the Influence of Authority in Matters of Opinion,’ London, 1849, 8vo; 2nd edition, London, 1875, 8vo. 12. ‘A Treatise on the Methods of Observation and Reasoning in Politics,’ London, 1852, 8vo, 2 vols. 13. ‘The Financial Statement, 1857. Speech of the Chancellor of the Exchequer in Committee of Supply,’ &c., London, 1857, 8vo. 14. ‘Speech … on the Introduction of the Bill for the better Government of India,’ London, 1858, 8vo. 15. ‘On Foreign Jurisdiction and the Extradition of Criminals,’ London, 1859, 8vo. 16. ‘Speeches … on Moving the Army Estimates, in Committee of Supply, in the House of Commons, March 3 and 6, 1862,’ London, 1862, 8vo. 17. ‘An Historical Survey of the Astronomy of the Ancients,’ London, 1862, 8vo. 18. ‘Suggestions for the Application of the Egyptological Method to Modern History; illustrated by examples’ (anon.), London, 1862, 8vo. 19. ‘A Dialogue on the Best Form of Government,’ London, 1863, 8vo; translated into French by P. M. Merroyer (Paris, 1867, 12mo), and into Italian (Padua, 1868, 8vo). An Italian translation of this dialogue is included in Brunialti's ‘Biblioteca di Scienze Politiche’ (Turin, 1884, 8vo), vol. ii. pt. i. pp. 1–63. His essay on the ‘Characteristics of Federal, National, Provincial, and Municipal Government’ (Letters, p. 364) was never published, and the pedigree which he compiled of his own family (ib. p. 425) appears to have been privately printed.