DR JOHN, a celebrated mathematician, was educated at Cambridge; where he became fellow of Queen's college, and continued so till, by his marriage, he vacated his fellowship. In 1640, he received holy orders, and became chaplain to the lady Vere. While he lived in this family, he cultivated the art of deciphering; and it is said that the elector of Brandenburg, for whom he explained several letters written in cipher, sent him a gold chain and medal. In 1643 he published, "Truth tried; or Animadversions on the Lord Brooke's treatise, called The Nature of Truth, &c." The next year he was chosen one of the secretaries or secretaries to the assembly of divines at Westminster. Dr Peter Turner, Savilian professor of geometry in Oxford, being ejected by the parliament-visitors in 1649, Mr Wallis was appointed to succeed him in that place. In 1653 he published at Oxford a Grammar of the English Tongue in Latin. In 1655 he entered the lists with Mr Hobbes; and their controversy lasted a considerable time. In 1657 the Doctor published his Mathematical Works. Upon the death of Dr Langbaine, he was chosen custos archivorum of the university. After the Restoration he met with great respect, the king himself entertaining a favourable opinion of him on account of some services he had done both to his royal father and himself. He was therefore confirmed in his places, admitted one of the king's chaplains in ordinary, and appointed one of the divines empowered to review the book of common prayer. He complied with the terms terms of the act of uniformity, and continued a steady conformit till his death. He was one of the first members of the Royal Society, and corresponded with many learned men. In 1667, the curators of the university at Oxford thought it for the honour of the university to collect the mathematical works of the Doctor, which had been printed separately, some in Latin, some in English, and published them all together in the Latin tongue, in three vols, folio. He died in 1703. He speaks of himself thus: "It hath been my endeavour all along to act by moderate principles, being willing whatever side was uppermost, to promote any good design for the true interest of religion, of learning, and of the public good." Besides the works above mentioned, he published many others.