This premise was directly opposed to the established aristotelian theory in which observation formed the basis of knowledge.
De Raey, who once called Descartes his best student, synthesized a hybrid model of the old Aristotelian and the new Cartesian concept.
From 1658 to 1662 he gave private lessons in medicine at Leiden University and tried to use his model as a basis for explaining human physiology.
Until now, nothing was known about the content of these lectures. The author recently found a dispute. It is a new dish on the Cartesian menu.