JOHN, an eminent physician and antiquary, was the eldest fon of John Greaves rector of Colemore, near Alresford in Hampshire, and born in 1602. He was educated at Balliol College in Oxford, from which he removed to Merton. He was afterwards, on the foot of his great merit, chosen geometry professor of Gresham college. His ardent thirt of knowledge foon carried him into feveral parts of Europe, where he eagerly feized every opportunity of improving it. His next voyage was into the eaftern countries; where nothing remarkable in the heavens, earth, or even subterraneous places, seems to have efcape his nice obfervation. He, with indefatigable induftry, and even at the peril of his life, collected a confiderable number of Arabic, Perfic, and Greek manuscripts, for Archbishop Laud. Of thefe he well knew the value, as he was a master of the languages in which they were written. He alfo collected for that prelate many oriental gems and coins. He took a more accurate survey of the pyramids than any traveller who went before him. On his return from the Eait, he visited feveral parts of Italy a fecond time. During his stay at Rome, he made a particular inquiry into the true fiate of the ancient weights and meafures. Soon after he had finifhed his fecond voyage, he was chosen Savilian professor of astronomy at Oxford. He was eminently qualified for this profeflorship, as the works of ancient and modern astronomers were familiar to him. His books relating to oriental learning, his Pyramidographia, or a description of the pyramids in Egypt, his Epocha Celebriores, and other curious and ufeful pieces, of which Mr Ward has given us a catalogue, thou him to have been a great man. Thofe which he intended to publish would have thown him to be a greater; but he was flopped in his great career by death in 1652.