ROGER, an excellent mathematician of the 18th century. He early discovered an inclination to the mathematics; and at 17 years of age, was admitted a pensioner of Trinity college, Cambridge. In 1756, he was appointed professor of astronomy in the professorship founded by Dr Plume archdeacon of Rochester, being chosen the first in that chair for his great merit and learning. In the year 1713, at the request of Dr Richard Bentley, he published at Cambridge, in 4to, a second edition of Sir Isaac Newton's Principia, with all the improvements which the author had annexed thereto: to which he prefixed an excellent preface. He prepared several useful books for the public; and wrote A Description of the great Meteor which appeared on the 6th of March 1716, published in the Philosophical Transactions. He lived but a little while to carry on the discourses for which he was eminently qualified; dying in the prime of his age in 1716, to the great regret of all the lovers of the sciences.

COTSWOLD, several sheep-cotes, and sheep feeding on hills. It comes from the Saxon cote, i.e., casa, "a cottage," and wold, "a place where there is no wood."

COPTHURUS, BUSKIN, a very high shoe or patten raised on soles of cork, worn by the ancient actors in tragedy, to make them appear taller and more like the heroes they represented, most of whom were supposed to be giants. It covered the greatest part of the leg, and was tied beneath the knee. Eschylus is said to have invented the cothurnus. See BUSKIN.