On the death of Whitaker in 1595, Richard Clayton became Master. If not a brilliant scholar, he commanded respect, and the tenor of many letters which have come down from that time shows that the Fellows in residence were on good terms with each other, and with those of the Society who had gone out into the world. The College was prosperous, and the building of the Second Court was the visible sign of returned efficiency. Clayton lived on into the reign of King James I., dying 2nd May 1612; besides being Master of St. John's, he was also Dean of Peterborough and a Prebendary of Lincoln.
During this period the College enjoyed a considerable reputation as a training ground for medical men. Thomas Linacre, physician to Henry VIII., founded in 1534 a medical lectureship in the College, endowing it with some property in London. The stipend of the lecturer was to be £12 a year, no mean sum in these days--being, in fact, the same as the statutable stipend of the Master. In the Elizabethan statutes special and detailed provisions are made for the continuance of the lectureship. These lay down that the lecturer must be versed in the works of Aristotle, and that he should lecture on the works of Galen, which Linacre had translated. The effect of the foundation was to attract a number of medical students to the College, many of whom seem to have obtained fellowships, for we find the Fellows petitioning Queen Elizabeth, while her code of statutes was under consideration, that Divines should be preferred to Physicians in the election of Senior Fellows; otherwise, they submitted, an undue proportion of Physicians would get on the seniority and rule the College. Further, they asked that the medical Fellows, as some return for their privileges, should attend on poor students free of charge. That the College school of medicine was a noted one is confirmed by the fact that three successive Presidents of the Royal College of Physicians were Fellows of St. John's: Richard Smith (1585-1589), William Baronsdale (1589-1600), and William Gilbert (1600-1601). Smith and Gilbert were physicians to Queen Elizabeth; Baronsdale and Gilbert had been Senior Bursars of the College. Of these Gilbert is the most celebrated; his treatise, _De Magnete_, is a scientific classic. Galileo spoke of Gilbert as "great to a degree which might be envied." Francis Bacon mentions the book with applause, and Hallam describes Gilbert as "at once the father of experimental philosophy in this island, and by a singular felicity and acuteness of genius, the founder of theories which have been revived after the lapse of ages, and are almost universally received into the creed of science." Gilbert, who always signs his name Gilberd or Gylberd in the College books, was Senior Bursar of the College in 1569, and President in the succeeding year.