Elisabeth Moreau

From antiquity, Galenic physicians extensively discussed the active powers of simple and compound drugs. In their views, simple drugs, that is, single ingredients, acted according to their material qualities and the properties of their substance. As for compound drugs, their efficacy resulted from the mutual interaction of their ingredients and their modes of preparation. In the late Renaissance, Galenic physicians and naturalists, such as Leonhart Fuchs and Pietro Andrea Mattioli, attempted to explain these pharmacological properties or “faculties” at the intersection of medicine, botany, and natural philosophy. This chapter examines the case of the Italian physician and botanist Andrea Cesalpino. His pharmacological treatise De medicamentorum facultatibus [On the Faculties of Drugs, 1593] was particularly significant for its reception of ancient and medieval texts on drug properties, materia medica, and the role of the senses in the knowledge of bodies.

This chapter examines the use of vegetal analogy in late Renaissance physiology through the case of the German physician Daniel Sennert. It is centered on Sennert’s explanation of generation, in particular the transmission of life through the vegetative soul within the seed, as developed in his early works on medicine and alchemy, the _Institutionum medicinae libri V_ and _De chymicorum…liber_. This chapter first summarizes Sennert’s account of generation and the seed’s “formative force” according to Aristotle and Galen, as well as his appraisal of the medical debates on the origin of the seed’s soul and form. Then, the next part explores Sennert’s own interpretation of the origin of forms, for which plant physiology served as a common denominator of his medical, alchemical and theological inclinations. Finally, this chapter considers how Sennert attempted to harmonize his reasoning with the Paracelsian account of generation, seed and life.

In late Renaissance medicine, the example of digestion was frequently invoked to prove the elemental composition of the human body. Food was considered as being decomposed in its first elements by the stomach, and digested into a thick juice, which was assimilated by the liver and the body parts. Such a process points to the structure of the human body into four elements that are transformed into different types of humors during several stages of “concoction”. This chapter examines the Galenic interpretation of digestion expounded by the French physician Jean Fernel (1497–1558) in his Physiologia (1567). In this treatise, Fernel states the body composition into elemental portions, while stressing the role of the “innate heat” as the physiological counterpart of the body’s essence or “substantial form”. He applies this view in his account of digestion, where he states that the conversion of food follows the rule of “mixture”. This chapter aims to explore how Fernel applies his interpretation of elements and innate heat to the process of digestion, as well as his sources in Galen’s De facultatibus naturalibus, Avicenna’s Canon and Aristotle’s Meteorologica. It first examines the role of the natural soul and its “nourishing” faculties in nutrition as a physiological function. It then considers the role of elements, humors and innate heat during the “concoction” of food in the stomach, liver and veins.