The twenty years which follow, the second period of Milton's career, developed and modified his nature and ideas in an unusual degree and fashion. Outwardly the occupations which they brought him appear chiefly as an unfortunate waste of his great poetic powers. The sixteen sonnets which belong here show how nobly this form could be adapted to the varied expression of the most serious thought, but otherwise Milton abandoned poetry, at least the publication of it, for prose, and for prose which was mostly ephemeral. Taking up his residence in London, for some time he carried on a small private school in his own house, where he much overworked his boys in the mistaken effort to raise their intellectual ambitions to the level of his own. Naturally unwilling to confine himself to a private sphere, he soon engaged in a prose controversy supporting the Puritan view against the Episcopal form of church government, that is against the office of bishops. There shortly followed the most regrettable incident in his whole career, which pathetically illustrates also the lack of a sense of humor which was perhaps his greatest defect. At the age of thirty-four, and apparently at first sight, he suddenly married Mary Powell, the seventeen-year-old daughter of a royalist country gentleman with whom his family had long maintained some business and social relations. Evidently this daughter of the Cavaliers met a rude disillusionment in Milton's Puritan household and in his Old Testament theory of woman's inferiority and of a wife's duty of strict subjection to her husband; a few weeks after the marriage she fled to her family and refused to return. Thereupon, with characteristic egoism, Milton put forth a series of pamphlets on divorce, arguing, contrary to English law, and with great scandal to the public, that mere incompatibility of temper was adequate ground for separation. He even proceeded so far as to make proposals of marriage to another woman. But after two years and the ruin of the royalist cause his wife made unconditional submission, which Milton accepted, and he also received and supported her whole family in his house. Meanwhile his divorce pamphlets had led to the best of his prose writings. He had published the pamphlets without the license of Parliament, then required for all books, and a suit was begun against him. He replied with 'Areopagitica,' an, eloquent and noble argument against the licensing system and in favor of freedom of publication within the widest possible limits. (The name is an allusion to the condemnation of the works of Protagoras by the Athenian Areopagus.) In the stress of public affairs the attack on him was dropped, but the book remains, a deathless plea for individual liberty.