ABSTRACT This article studies the theory of animal seeds as purely material entities in the early seventeenth-century medical writings of Antonio Ponce Santacruz, royal physician to the Spanish king Philipp IV. Santacruz adopts the theory of the eduction of substantial forms from the potentiality of matter, according to which new kinds of causal powers can arise out of material composites of a certain complexity. Santacruz stands out among the late Aristotelian defenders of eduction theory because he applies the concept of (...) an instrument of direction developed by the medieval Avicenna commentator Gentile da Foligno and gives a novel turn to this concept by interpreting animal seeds as separate instruments. The article situates Santacruz's theory in the context of early modern debates about the concept of the eduction of forms, as well as in the context of early modern debates about the concept of separate instruments. Particular attention is paid to Santacruz's responses to the biological views of Julius Caesar Scaliger and Thomas Feyens. Santacruz's response to Scaliger turns out to be central for his explication of the eduction relation, and Santacruz's response to Feyens turns out to be central for his explication of the nature of instrumental causation. (shrink)

Inspired by Christian Platonism as developed in the late fifteenth-century Florentine milieu, the French physician Jean Fernel proposed a particular interpretation of Galen in a medico-philosophical work entitled On the Hidden Causes of Things . With this interpretation, he responded to the serious and urgent need for a reconciliation of the newly reconstituted Galen of Renaissance humanism with Christian faith. The present study examines Fernel's strategy and method in constructing this singular Galenic body of doctrine, special attention being given to (...) the roles attributed to the Creator, the formative force, and the soul. Subsequently, an analysis of the notions of spirit and of its innate heat as indispensable instruments of Fernel's physiology will uncover the very target of his criticism of materialism. (shrink)