An annotated translation of Jean Fernel’s On the Hidden Causes of Things (1542). A major innovatory work in Renaissance natural philosophy and medicine, and a crucially important source for understanding the notion of occult qualities, with a scholarly introduction.

This volume deals with philosophically grounded theories of animal generation as found in two different traditions: one, deriving primarily from Aristotelian natural philosophy and specifically from his Generation of Animals; and another, deriving from two related medical traditions, the Hippocratic and the Galenic. The book contains a classification and critique of works that touch on the history of embryology and animal generation written before 1980. It also contains translations of key sections of the works on which it is focused. It looks at two different scholarly communities: the physicians (medici) and philosophers (philosophi), that share a set of textual resources and philosophical lineages, as well as a shared problem (explaining animal generation), but that nevertheless have different concerns and commitments. The book demonstrates how those working in these two traditions not only shared a common philosophical background in the arts curricula of the universities, but were in constant intercourse with each other. This book presents a test case of how scholarly communities differentiate themselves from each other through methods of argument, empirical investigation, and textual interpretations. It is all the more interesting because the two communities under investigation have so much in common and yet, in the end, are distinct in a number of important ways.

A century and a half after the Black Death killed over a third of the population of Western Europe, a new plague swept across the continent. The Great Pox - commonly known as the French Disease - brought a different kind of horror: instead of killing its victims rapidly, it endured in their bodies for years, causing acute pain, disfigurement and ultimately an agonising death. The authors analyse the symptoms of the Great Pox and the identity of patients, richly documented in the records of the massive hospital of 'incurables' established in early sixteenth-century Rome. They show how the disease threw accepted medical theory and practice into confusion and provoked public disputations among university teachers. And at the most practical level they reveal the plight of its victims at all levels of society, from ecclesiastical lords to the poor who begged in the streets. Examining a range of contexts from princely courts and republics to university faculties, confraternities and hospitals, the authors argue powerfully for a historical understanding of the Great Pox based on contemporary perceptions rather than on a retrospective diagnosis of what later generations came to know as 'syphilis'.