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. (shrink)

Girolamo Cardano makes a number of surprising, even shocking claims about the soul in his De subtilitate, one of the most widely read works of natural philosophy in the sixteenth century. When he was finally investigated by the Roman Inquisition and the Index, these claims did not go unnoticed. This study will narrow in on three passages marked as heretical by the first Holy Office censor of De subtilitate. It will consider the Inquisition’s priorities and ask about materialism, determinism, and (...) conceptual inconsistency in Cardano’s views on the soul. The study will give special attention to the claim made by Cardano that souls can be reduced to celestial heat. In addition to De subtilitate, several of Cardano’s other works will be considered for added perspective, especially Contradicentium medicorum libri duodecim. (shrink)

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. (shrink)

Sixteenth century pharmacology was still very much under the influence of a distinction going back to ancient medicine: the distinction between effects of medicaments that were taken to be explainable by the elementary qualities, their mutual modification in mixture, and the combination of these modified elementary qualities on the one hand, and the effects of medicaments that were taken not to be explicable in this manner.1 Galen coined the expression that a medicament of the latter kind possesses the capacity of (...) acting "by its whole substance,"2 and the question of how actions of the whole substance could be explicated gave rise to heated controversies in early modern pharmacology. Did Galen just... (shrink)

The generation of animals was a difficult phenomenon to explain in the seventeenth century, having long been a problem in natural philosophy, theology, and medicine. In this paper, I explore how generation, understood as epigenesis, was directly related to an idea of rational nature. I examine epigenesis—the idea that the embryo was constructed part-by-part, over time—in the work of two seemingly dissimilar English philosophers: William Harvey, an eclectic Aristotelian, and Margaret Cavendish, a radical materialist. I chart the ways that they (...) understood and explained epigenesis, given their differences in philosophy and ontology. I argue for the importance of ideas of harmony and order in structuring their accounts of generation as a rational process. I link their experiences during the English Civil war to how they see nature as a possible source for the rationality and concord sorely missing in human affairs. (shrink)

Thanks to how Girolamo Fracastoro defines the different types of contagion in his book De contagione, et contagiosis morbis et eorum curatione, libri tres (1546), and his defense of the “seeds of contagion” (seedbed) as the cause of contagious diseases, he is considered today one parent of the modern epidemiology and microbiology. One of the crucial problems in this book is to explain the remote transmission of the contagious diseases refuting the etiologic use of the occult qualities. The aim of (...) this study is to investigate the philosophical background of the problem and draw the conclusions that his solution had for medicine and for science in general. (shrink)

The conception of contagious disease that Girolamo Fracastoro provides in his work De contagione et contagiosis morbis, marks the origin of modern epidemiology and microbiology. This conception puts into play the Galenic and Aristotelian traditions of research, faced with its own conceptual limitations of the growing mechanistic thought of the time. According to Fracastoro, epidemic diseases spread by invisible living germs called seminaria, begotten by corrupted humours. Fracastoro resorted to the old notions of "sympathy" and "antipathy" to respond to questions (...) about how seminaria is transmitted from one body to another, and what is the specificity that limits its transmission to certain species and organs. Like Galileo and Descartes, Fracastoro tries to establish a dialogue in the field of medicine between the Aristotelian vitalism and the modern mechanistic perspective. The purpose of this paper is to highlight the ideological, theoretical and conceptual assumptions, both philosophical and scientific, assumed by Fracastoro with regard to the problem of contagion. (shrink)

1. At least since W.F. Edwards’ pioneering articles on medieval and renaissance interpretations of the prologue to Galen's Art of Medicine,1 it has often been maintained that Latin scholastics inte...