His history, so far as is known, may be briefly told. He was born at Ilchester, in Somersetshire, and studied at the University of Oxford. Thence he went to the University of Paris, where he took the degree of doctor of theology. He was familiar with Latin, Greek, Hebrew, and Arabic. Of mathematics he truly says that "it is the first of all the sciences; indeed, it precedes all others, and disposes us to them." In advance of his age, he denied the authority of Aristotle, and tells us that we must substitute that of experiment for it. Of his astronomical acquirements we need no better proof than his recommendation to Pope Clement IV. to rectify the Calendar in the manner actually done subsequently. If to him be rightly attributed the invention of spectacles, the human race is his debtor. He described the true theory of telescopes and microscopes, saying that lenses may be ground and arranged in such a way as to render it possible to read the smallest letters at incredible distances, and to count grains of sand and dust, because of the magnitude of the angle under which we may perceive such objects. He foresaw the greatest of all inventions in practical astronomy--the application of optical means to instruments for the measurement of angles. He proposed the propulsion of ships through the water and of carriages upon roads by merely mechanical means. He speculated upon the possibility of making a flying-machine. Admitting the truth of alchemy, he advised the experimenter to find out the method by which Nature makes metals and then to imitate it. He knew that there are different kinds of air, and tells us that there is one which will extinguish flame. These are very clear views for an age which mistook the gases for leather-eared ghosts. He warned us to be cautious how we conclude that we have accomplished the transmutation of metals, quaintly observing that the distance between whitened copper and pure silver is very great. He showed that air is necessary for the support of fire, and was the author of the well-known experiment illustrating that fact by putting a lighted lamp under a bell-jar and observing its extinction.