In the sphere of political science, the man next in power to Mill was Sir George Cornewall Lewis. As Chancellor of the Exchequer in the first administration of Lord Palmerston, Lewis had the opportunity of making a practical acquaintance with his subject; but his theories were formed earlier. Extensive knowledge, combined with clearness of intellect and independence of judgment, gives value to his work. His _Inquiry into the Credibility of Early Roman History_ (1855) was remarkable for its attack upon the theories of Niebuhr, which were in those days accepted with an almost superstitious reverence. But previous to this Lewis had written his most important book, _The Influence of Authority in Matters of Opinion_ (1849), a well reasoned and well written argument, worthy of attention in these days when there seems to be a disposition to forget the limits beyond which the influence is illegitimate. Lewis teaches the wisdom and even the necessity of submitting to 'authority' where we cannot investigate for ourselves, and where all who are competent to form an opinion are agreed; but he is careful not to set up any absolute and indefeasible authority which might dictate to reason and against reason. Towards the close of the period there are noticeable traces of a new school superseding both Utilitarianism and Positivism. This school, nourished upon German idealism, had its centre at Oxford, and the men who have done the principal work in it were pupils of Jowett. They belong however to the later period and come within our present scope only as an indication of tendency. [Sidenote: Herbert Spencer (1820-1903).]