The ‘Humidum Radicale’ in Thirteenth-Century Medicine

Abstract

A number of recently published studies have drawn attention to the ‘radical moisture,’ a concept developed in classical antiquity and the Middle Ages to help explain the nature of life and the occurrence of aging and of fevers. These studies have examined the broad history of the concept over a span of two thousand years; they have, however, not presented in detail the sequence of the transmission and evolution of the concept in the Middle Ages. It is my intent to focus upon the history of the radical-moisture concept in the twelfth and thirteenth centuries, to try to establish the particular stages by which it entered medieval medical doctrine, and in particular to examine the importance of Avicenna's Canon for western physicians in consolidating their first disorganized impressions of the concept. I shall illustrate the stages in the transmission process by referring to the use of the concept at the University of Montpellier, for that school has left us a number of texts from the thirteenth century that reveal how the introduction of new Arabic or Greek medical works could alter the medieval academic physician's approach to a familiar topic; they also reveal the way in which personal tastes and interests could lead colleagues to react differently to new materials.

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