As an instance of the mind affecting the body, this philosopher cited the fear that a man might feel crossing a tree-trunk over a gorge. According to tradition, this philosopher illustrated the faculty of “prehension” by putting a wolf within sight of a caged sheep, which, though in no danger, died of stress. This philosopher argued that the contingent universe requires a “necessary existent” (15[1])in a unique proof (15[1])of the existence (15[1])of God. This philosopher demonstrated the existence of the (*) soul with an “argument from abstraction,” which considers an adult man who pops into existence and receives no data from his senses. That thought experiment is this philosopher’s “Floating Man.” For 10 points, name this Islamic philosopher who authored the philosophical Book of Healing, as well as the Canon of Medicine. ■END■