Liberty was published in 1859, when the nineteenth century was half over, but in its general spirit and in some of its special tendencies the little tract belongs rather to the standpoint of the eighteenth century than to that which saw its birth. In many of his speculations John Stuart Mill forms a sort of connecting link between the doctrines of the earlier English empirical school and those which we associate with the name of Mr. Herbert Spencer. In his Logic, for instance, he represents an advance on the theories of Hume, and yet does not see how profoundly the victories of Science modify the conclusions of the earlier thinker. Similarly, in his Political Economy, he desires to improve and to enlarge upon Ricardo, and yet does not advance so far as the modifications of political economy by Sociology, indicated by some later-and especially German-speculations on the subject. In the tract on Liberty, Mill is advocating the rights of the individual as against Society at the very opening of an era that was rapidly coming to the conclusion that the individual had no absolute rights against Society. - Taken from "On Liberty" by John Stuart Mill