Such were some of the lights and some of the enterprises of that great age, when the profoundest questions pertaining to philosophy, religion, law, and government were discussed with the enthusiasm and freshness of a revolutionary age; when men felt the inspiration of a new life, and looked back on the Middle Ages with disgust and hatred, as a period which enslaved the human soul. But what peculiarly marked that period was the commencement of those marvellous discoveries in science which have enriched our times and added to the material blessings of the new civilization. Tycho Brahe, Copernicus, Galileo, Kepler, and Bacon inaugurated the era which led to progressive improvements in the physical condition of society, and to those scientific marvels which have followed in such quick succession and produced such astonishing changes that we are fain to boast that we have entered upon the most fortunate and triumphant epoch in our world's history. Many men might be taken as the representatives of this new era of science and material inventions, but I select Galileo Galilei as one of the most interesting in his life, opinions, and conflicts. Galileo was born at Pisa, in the year 1564, the year that Calvin and Michael Angelo died, four years after the birth of Bacon, in the sixth year of the reign of Elizabeth, and the fourth of Charles IX., about the time when the Huguenot persecution was at its height, and the Spanish monarchy was in its most prosperous state, under Philip II. His parents were of a noble but impoverished Florentine family; and his father, who was a man of some learning,--a writer on the science of music,--gave him the best education he could afford. Like so many of the most illustrious men, he early gave promise of rare abilities. It was while he was a student in the university of his native city that his attention was arrested by the vibrations of a lamp suspended from the ceiling of the cathedral; and before he had quitted the church, while the choir was chanting mediaeval anthems, he had compared those vibrations with his own pulse, which after repeated experiments, ended in the construction of the first pendulum,--applied not as it was by Huygens to the measurement of time, but to medical science, to enable physicians to ascertain the rate of the pulse. But the pendulum was soon brought into the service of the clockmakers, and ultimately to the determination of the form of the earth, by its minute irregularities in diverse latitudes, and finally to the measurement of differences of longitude by its connection with electricity and the recording of astronomical observations. Thus it was that the swinging of a cathedral lamp, before the eye of a man of genius, has done nearly as much as the telescope itself to advance science, to say nothing of its practical uses in common life.