To these relatively happy times belong Paul Lafargue's reminiscences--("Neue Zeit," 9th year, Vol. I., pp. 10-17, 37-42)--of his intercourse with the Marx family. In particular he depicts the personality of the author of "Capital." In the bosom of his family and among the circle of his friends on Sunday evenings Marx was a genial companion, full of wit and humour. "His dark black eyes sparkled with mirth and with a playful irony whenever he heard a witty remark or a prompt repartee." He was a tender, indulgent father, who never asserted the parental authority. His wife was his helper and companion in the truest sense of the word. She was four years older than he, and notwithstanding her aristocratic connections and in spite of the great hardships and persecutions which for years she had to suffer by the side of her husband, she never regretted having taken the step which linked her destiny with that of Marx. She possessed a cheerful, bright disposition and an unfailing tact, easily winning the esteem of every one of her husband's acquaintances, friends, and followers. "Heinrich Heine, the relentless satirist, feared Marx's scorn; but he cherished the greatest admiration for the keen, sensitive mind of Marx's wife. Marx esteemed so highly the intelligence and the critical sense of his wife that he told me in 1866 he had submitted all his manuscripts to her and that he set a high value upon her judgment." Six children were born to the Marxes, four girls and two boys, of whom only three of the girls grew up--Jenny, who married Charles Longuet; Laura, who became the wife of Paul Lafargue; and the unhappy but highly-gifted Eleanor, who spent 14 sad years of her life by the side of Dr. Edward Aveling. The sixties were undoubtedly the happiest years of Marx's life, and seemed to promise an abundant harvest in his later life. But his health soon began to fail, and did not allow him to complete his work. The most productive years of Marx's life were between 1837 and 1847 and between 1857 and 1871. All his valuable work falls within these years: the "Poverty of Philosophy," the Communist Manifesto, his activity in the International, "Capital," the Civil War in France (the Commune). V. THE INTERNATIONAL.