John Stuart Mill was born on 20th May 1806. He was a delicate child, and the extraordinary education designed by his father was not calculated to develop and improve his physical powers. "I never was a boy," he says; "never played cricket." His exercise was taken in the form of walks with his father, during which the elder Mill lectured his son and examined him on his work. It is idle to speculate on the possible results of a different treatment. Mill remained delicate throughout his life, but was endowed with that intense mental energy which is so often combined with physical weakness. His youth was sacrificed to an idea; he was designed by his father to carry on his work; the individuality of the boy was unimportant. A visit to the south of France at the age of fourteen, in company with the family of General Sir Samuel Bentham, was not without its influence. It was a glimpse of another atmosphere, though the studious habits of his home life were maintained. Moreover, he derived from it his interest in foreign politics, which remained one of his characteristics to the end of his life. In 1823 he was appointed junior clerk in the Examiners' Office at the India House.

Mill's first essays were written in the Traveller about a year before he entered the India House. From that time forward his literary work was uninterrupted save by attacks of illness. His industry was stupendous. He wrote articles on an infinite variety of subjects, political, metaphysical, philosophic, religious, poetical. He discovered Tennyson for his generation, he influenced the writing of Carlyle's French Revolution as well as its success. And all the while he was engaged in studying and preparing for his more ambitious works, while he rose step by step at the India Office. His Essays on Unsettled Questions in Political Economy were written in 1831, although they did not appear until thirteen years later. His System of Logic, the design of which was even then fashioning itself in his brain, took thirteen years to complete, and was actually published before the Political Economy. In 1844 appeared the article on Michelet, which its author anticipated would cause some discussion, but which did not create the sensation he expected. Next year there were the "Claims of Labour" and "Guizot," and in 1847 his articles on Irish affairs in the Morning Chronicle. These years were very much influenced by his friendship and correspondence with Comte, a curious comradeship between men of such different temperament. In 1848 Mill published his Political Economy, to which he had given his serious study since the completion of his Logic. His articles and reviews, though they involved a good deal of work—as, for instance, the re-perusal of the Iliad and the Odyssey in the original before reviewing Grote's Greece—were recreation to the student. The year 1856 saw him head of the Examiners' Office in the India House, and another two years brought the end of his official work, owing to the transfer of India to the Crown. In the same year his wife died. Liberty was published shortly after, as well as the Thoughts on Parliamentary Reform, and no year passed without Mill making important contributions on the political, philosophical, and ethical questions of the day.

Seven years after the death of his wife, Mill was invited to contest Westminster. His feeling on the conduct of elections made him refuse to take any personal action in the matter, and he gave the frankest expression to his political views, but nevertheless he was elected by a large majority. He was not a conventional success in the House; as a speaker he lacked magnetism. But his influence was widely felt. "For the sake of the House of Commons at large," said Mr. Gladstone, "I rejoiced in his advent and deplored his disappearance. He did us all good." After only three years in Parliament, he was defeated at the next General Election by Mr. W. H. Smith. He retired to Avignon, to the pleasant little house where the happiest years of his life had been spent in the companionship of his wife, and continued his disinterested labours. He completed his edition of his father's Analysis of the Mind, and also produced, in addition to less important work, The Subjection of Women, in which he had the active co-operation of his step-daughter. A book on Socialism was under consideration, but, like an earlier study of Sociology, it never was written. He died in 1873, his last years being spent peacefully in the pleasant society of his step-daughter, from whose tender care and earnest intellectual sympathy he caught maybe a far-off reflection of the light which had irradiated his spiritual life.