Book 4
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PLATO and Democritus place its residence in the whole head. Strato, in that part of the forehead where the eyebrows are separated. Erasistratus, in the Epikranis, or membrane which involves the brain. Herophilus, in that sinus of the brain which is the basis of it. Parmenides, in the whole breast; which opinion is embraced by Epicurus. The Stoics are generally of this opinion, that the seat of the soul is throughout the heart, or in the spirit which is about it. Diogenes, in the arterial ventricle of the heart, which is also filled with vital spirit. Empedocles, in the mass of the blood. There are that say it is in the neck of the heart, others in the pericardium, others in the midriff. Certain of the Neoterics, that the seat of the soul is extended from the head to the diaphragm. Pythagoras, that the animal part of the soul resides in the heart, the intellectual in the head.
Chapter VI. OF THE MOTION OF THE SOUL.
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PLATO believes that the soul is in perpetual motion, but that the mind is immovable with respect to motion from place to place. Aristotle, that the soul is not naturally moved, but its motion is accidental, resembling that which is in the forms of bodies.
Chapter VII. OF THE SOUL’S IMMORTALITY.
