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 sisted in the cultivation of his garden, and in the company and conversation of his friends. He loved music, drawing, and poetry; and is said to have been so fond of Ariosto, that he knew the whole of the 'Orlando' by heart. He had few books; 'the best book,' he said, 'is nature.' A complete edition of his works, in thirteen volumes, appeared at Milan in 1803, the style of which is natural and fluent, so elegant and pure, that it has been held up by competent judges as a model of classical Italian. 'Altogether,' says Professor Playfair, 'Galileo is one of those to whom human knowledge is under the greatest obligation. His discoveries in the theory of motion, in the laws of the descent of heavy bodies, and in the motion of projectiles, laid the foundation of all the great improvements which have since been made by the application of mathematics to natural philosophy. If to these we add the invention of the telescope, the discoveries made by that instrument, the confirmation of the Copernican system which these discoveries afforded, and lastly, the wit and argument with which he combated and exposed the prejudice and presumption of the schools, we must admit that the history of human knowledge contains few greater names than that of Galileo.'

KEPLER.

Cotemporary with Tycho Brahé and Galileo, and to some extent the associate and successor of the former, was John Kepler, one of the most eminent astronomers who have appeared in any age, and to whom the science is indebted for much of its present perfection. He was born December 27, 1571, at Wiel in Wurtemberg, and was descended of a noble but reduced family. His father, originally an officer of distinction in the army of Wurtemberg, was, at the time of young Kepler's birth, in the humble capacity of a small inn-keeper; and thus, as is too often the case with genius, our philosopher had to struggle into fame through poverty and the vicissitudes of his father's fortune. Poor, unbefriended, of a weakly constitution, and one of the most diminutive of children, Kepler received the rudiments of knowledge at the Monastic school of Maulbrunn, where he gave early indications of talent, and of that irrepressible spirit which, amid the severest obsrtuctions, was never diverted from the main object of its pursuit. After his father's death, which took place in his eighteenth year, he left Maulbrunn, and succeeded in entering the college of Tubingen. Here he completed the course of study then prescribed—first philosophy and mathematics, and then theology; taking the degree of Bachelor in the year 1588, and that of Master of Philosophy in the year 1591. Of apt inquiring powers as a divine, and of more than average eloquence as a preacher, Kepler could now have readily succeeded in the church; but mathematics and the exact sciences were his favorite themes; and it may be fairly questioned if ever he turned a single thought to the clerical profession, beyond what the curriculum of the university compelled. In 1593-4, his reputation as a geometrician had so increased, that he was invited to fill the mathematical chair in the university of Gratz, in Styria. Here he pursued his astronomical studies with the most commendable zeal, devoting himself especially to the investigation of the physical causes of the motion of the celestial bodies.

Shortly after his installment, he married a lady descended from a noble