There is probably no more amusing feature of quite a number of supposedly respectable and presumably authoritative historical works written in English than this assumption with regard to the absence of surgery during the later Middle Ages. Only the most complete ignorance of the actual history of medicine and surgery can account for it. The writers who make such assertions must never have opened an authoritative medical history. Nothing illustrates so well the expression of the editors of the "Cambridge Modern History" referred to more than once in these pages that "in view of changes and of gains such as these [the jointing of original documents] it has become impossible for historical writers of the present day to trust without reserve even to the most respected secondary authority. The honest student finds himself continually deserted, retarded, misled by the classics of historical literature." Fortunately for us this sweeping condemnation does not hold to any great extent for the medical historical classics. All of the classic historians of medicine tell us much of the surgery of the thirteenth and fourteenth centuries, and in recent years the republication of old texts and the further study of manuscript documents of various kinds have made it very clear that there is almost no period in the history of the world when surgery was so thoroughly and successfully cultivated as during the rise and development of the universities and their medical schools in the thirteenth and fourteenth centuries. It is interesting to trace the succession of great contributors to surgery during these two centuries. We know their teaching not from tradition, but from their text-books so faithfully preserved for us by their devoted students, who must have begrudged no time and spared no labor in copying, for many of the books are large, yet exist in many manuscript copies.