In 1573 Father Everard Mercurian, a Belgian, was elected to succeed Saint Francis Borgia. He was sixty-eight years old at the time of his election, and lived eight years after. He drew out of the Constitution various summaries of rules for the guidance of the chief officers in the Society. Those which concern studies are given in a few pages of the Monumenta.[133] At his death, a young man thirty-seven years old, who had entered the Order only about twelve years before, was elected to succeed him. This was Claudius Aquaviva, son of Prince John Aquaviva, Duke of Atri. He was a man who, for his superior executive abilities and his services rendered to the Order in times most critical, has been regarded as a second founder. As to what his administration saw effected in the matter of education, the _Ratio Studiorum_ bears witness. He governed the Society during thirty-four years. Mutius Vitelleschi, one of the mildest and gentlest of men, but not on that account ineffective in his government, succeeded Aquaviva, filling a term of thirty-one years, from 1615 to 1646. Various pedagogic interests occupied the attention of the general assembly, by which he was elected; in particular, the promotion of Humane Letters, the means of supplying Professors, and the searching character of the examinations ordained, at every step in their studies, for the members of the Society. The farther the Society advanced in history, the less there was of new legislation. The tension grew on the side of administration; and the urgency shown by general assemblies evinces this. The philological seminary was developed for the junior scholastics; and a classic form drawn up for it by Jouvancy. As distinguished talents for preaching and governing were treated with the special favor of being allowed to compensate for some deficiencies, in the qualifications requisite for the degree of Profession in the Order, so special legislation provided for similar eminence in literature, in Oriental languages, in Greek and Hebrew. Mathematics had, from the first, been a department of activity native to the energies of the Company. The schools of Geography and History developed in the seventeenth and at the beginning of the eighteenth centuries. The school of modern Physics then asserting itself, and running so close upon the field of Metaphysics, was subjected to regulations in the assemblies of 1730 and 1751.