In 1589, was published the _Martyrology_ of Baronius, the last work completed under Plantin’s personal supervision. He died in the latter part of the same year, being then seventy-five years of age. By his will, the larger portion of the property in Antwerp, together with the responsibility for its direction, was left to his son-in-law, John Moretus, who had for some years had a part in its management. Plantin had no sons, but appears to have been exceptionally fortunate in his sons-in-law. He had had seven daughters, six of whom lived to be married. John Moretus was the husband of the eldest. The third had married Raphelengien or Raphelengius, who had taken over, before Plantin’s death, the printing-office at Leyden, and who, as Printer for the University, issued an important series of scholarly and scientific works. Later, he was made Professor of Hebrew, uniting with the responsibilities of an instructor the work of a printer. The printing and publishing business of the Plantin House in Antwerp was largely expanded by Balthasar Moretus, son of John who died in 1641. The work of the printing establishment continued in the hands of Plantin’s descendants until 1867, and the concern had, therefore, a continuous existence of nearly three centuries, being at the time its work terminated, probably the oldest book-manufacturing firm in the world. In 1867, the buildings of the Plantin Press were purchased by the city of Antwerp for 1,200,000 francs, and the Plantin Museum was instituted. In this museum are exhibited all the details of book-making in the sixteenth and seventeenth centuries, together with the earlier records and correspondence of the firm, the series of which has been preserved nearly complete. As far as can be judged from this correspondence, and from memoirs of the men of letters and others with whom the great Antwerp publisher had dealings, his relations with his authors, editors, and correspondents generally were thoroughly harmonious and satisfactory both ways. The years of Plantin’s business career had been troublous ones, and had brought with them many disasters, losses, and perplexities. He appears, however, to have been exceptionally successful in avoiding quarrels and disputes. The only client with whom he had an issue was King Philip, and the only lawsuit in which he was engaged was that brought against him for heresy (_in absentio_) by the censorship of Antwerp. This is an extremely creditable record for a publisher who carried on such extended and varied undertakings, and who, in many of his arrangements with authors, was obliged himself to make the business precedents. The authors must have been fairly satisfied, for in the long series of the letters of the publishing business, there are practically no complaints; and there is no record of anything in the shape of an issue or even of a serious difference of opinion between Plantin and any of his correspondents,