was an interruption in the development of science. The ‘revival of letters’ deflected interest from matter to literary style and, in turning back to classical antiquity, its devotees affected to ignore the scientific progress of the previous three centuries. The same absurd conceit that led the humanists to abuse and misrepresent their immediate predecessors for using Latin constructions unknown to Cicero and to put out the propaganda which, in varying degrees, has captivated historical opinion until quite recently, also allowed them to borrow from the scholastics without acknowledgment. This habit affected almost all the great scientists of the 16th and 17th centuries, whether Catholic or Protestant, and it has required the labors of a Duhem or a Thorndike or a Maier to show that their statements on matters of history cannot be accepted at their face value.