THE POWER OF SEMEN. ARISTOTLE AND SOME GALEN’S FALLACIES
THE POWER OF SEMEN. ARISTOTLE AND SOME GALEN’S FALLACIES

Summary/Abstract: In this paper, I try to demonstrate how critical empiricism and philosophical reasoning intertwine with each other and affected the development of medicine. It is a case study considering the problems of generation and semen in the writings of Aristotle and Galen via relationship between such concepts as matter, form, movement, change, causes and some others. The main question addressed in the paper is the reason of Galen’s return to Hippocratic paradigm of two-semina (male and female). I argue that the reason is two-fold: 1) Different philosophical reasoning and erroneous understanding of some aspects of Aristotle’s embryological model by Galen. 2) Empirical discoveries, which proved to be wrong. I demonstrate that Galen’s understanding of form/matter relationship, and his view on matter as an underling principle conditioned his understanding of the notion of physical change, that allowed him to speak about conception only as quantitative mixture between equal substrata. Finally, I show that Galen’s view on teleology and his limited understanding of formal/ final vs efficient causes and their relationship forced him to claim the inadequacy of Aristotle’s biology and necessitated Galen to introduce emendations in definitions of seminal faculties of genders and reproductive fluids.

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