The methodology of natural sciences in antiquity and the second book of Galen's de Placitis Hippocratis et Platonis

In this article, based on the second book of Galen's De placitis Hippocratis et Platonis, we analyze scientific method of the famous anatomist and philosopher. We discuss experimental, logical and philosophical argumentation that Galen employs in his proof that the rational part of the soul situated in human brain. We study his polemics with Chrysippus, who declares that the rational part of the soul is located in the heart, and conclude that the treatise by Galen sets the standards of scientific studies in antiquity, which combines medical, philosophical and moral components.