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The chair of mathematics in the university of Padua having been vacant for five years, the republic of Venice had resolved to fill it up; and, on the recommendation of Guido Ubaldi, Galileo was appointed to it, in 1592, for a period of six years. Previous to this event, Galileo had lost his father, who died, in 1591, at an advanced age.

Opere di Galileo. Milano, 1810, vol. iv. p. 248-257. Through the Cardinal del Monte, the brother-in-law of Ubaldi, the reigning Duke of Tuscany, Ferdinand de Medici was made acquainted with the merits of our young philosopher; and, in 1589, he was appointed lecturer on mathematics at Pisa.

This work gained for its author the esteem of Guido Ubaldi, who had distinguished himself by his mechanical and mathematical acquirements, and who engaged his young friend to investigate the subject of the centre of gravity in solid bodies. The treatise on this subject, which Galileo presented to his patron, proved the source of his future success in life. De Insidentibus in Fluido.

Father Hecker was in Rome when, in March, 1875, his old friend and patron and first spiritual adviser, Archbishop McCloskey, was made Cardinal. He was much rejoiced, and sent the Cardinal a rich silk cassock, and gave a public banquet to Monsignor Roncetti and Doctor Ubaldi, who were to carry the insignia of the cardinalate to New York.