The meetings, at which Christopher Wren, young as he was, appears to have been a constant attendant, were frequently held at the house of Dr. Goddard for the convenience of his having there a workman skilled in the nice work of grinding glasses for microscopes and telescopes. Dr. Goddard became body physician to Cromwell, was by him made Warden of Merton College, Oxford, and subsequently represented the university in Parliament. Dr. Wallis, a famous Oxford mathematician, was employed by the Parliament to decipher the King's cabinet of letters taken at Naseby, and also was proved by Matthew Wren, the son of the Bishop, to have deciphered several very important letters sent by Charles II. to England, and intercepted at Dunkirk. As by degrees these meetings were more largely attended, and men came who held very different opinions from those of Dr. Goddard and Dr. Wallis, the exclusion of theology and politics from the discussions was a needful precaution. Many inventions of Christopher's date from this time, a design for a reflecting dial for the ceiling of a room, ornamented with quaint figures and devices, some Latin lines ending in a chronogram of his age, and the date of the invention, suggested probably by the one in the rectory at East Knoyle, which he had known from a child; an instrument to write in the dark; and an instrument of use in gnomonics.[48] At the same time he had attracted the notice of Sir Charles Scarborough, a friend of Dean Wren's, then just rising to fame as a surgeon. Christopher, whose health, as has been said, was delicate, fell dangerously ill and considered that he owed his life to the skilful care of his new friend. Dr. Scarborough, who could recite in order all the propositions of Euclid and Archimedes, and could apply them, found in his patient a kindred spirit, and induced Wren, young as he was, to undertake the translation into Latin of the 'Clavis Aurea,' by the Rev. W. Oughtred, a mathematical treatise of great reputation. [_MR. OUGHTRED._] That Christopher was able to satisfy the old man is evident from the preface, even while making allowance for the complimentary style of the time. Mr. Oughtred speaks of-- 'Mr. Christopher Wren, Gentleman Commoner of Wadham College, a youth generally admired for his talents, who, when not yet sixteen years old, enriched astronomy, gnomonics, statics and mechanics, by brilliant inventions, and from that time has continued to enrich them, and in truth is one from whom I can, not vainly, look for great things.'[49]