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J Borelli

power, ed and mathe

BORELLI, (J. AtenoNso) a celebrat ed philosopher and mathematician, born at Naples-the 28th of January, 1608. He was professor of philosophy and mathe matics in some of the most celehra- ed universities of Italy, particularly at Flo rence and Pisa, where he became highly in favour with the princes of the house of Medicis. But having been concerned in the revolt of Messina, he was obliged to retire to Rome, where he spent the remainder of his life, under the protection of Chris tina, Queen of Sweden, who honoured him with her friendship, and, by her libe rality towards him, softened the rigour of his hard fortune. Ile continued two years in the convent of the regular clergy of St. Panteleon, called the" Pious Schools," where he instructed the youth in mathe matical studies. And this study he pro secuted with great diligence for many years afterwards, as appears by his cor respondence with several ingenious ma thematicians of his time, and the frequent mention that has been made of him by others, who have endeavoured to do jus tice to his memory. He wrote a letter to Mr. John Collins, in which he discovers a

great desire, and endeavours to promote the improvement of those sciences ; he also speaks of his correspondence with, and great affection for, Mr. Henry Olden burg, Secretary of the Royal Society ; and Dr. ; and of the Men late learned Mr. Boyle. lie died of a pleuri sy, in his 72d year, December Si, 1679. His principal work was "De Motu Ani malium," in two volumes, small 4to. The object of this work was to explain the functions of animal bodies, on mechani cal principles. He describes the fibres of the muscles, and measures the power or force which each possesses, and the power of them collectively. ffe points out in what manner that power is increas ed or diminished, by the manner in which the fleshy fibres are joined to the tendons. He calculates the power of the heat, in propelling the blood, which he supposes equal to 180,000 pounds weight. In his calculations, Borelli was found to have erred in many respects, but his principles were generally admitted,