WHAT IS THE PRINCIPAL PART OF THE SOUL, AND IN WHAT PART OF THE BODY IT RESIDES.
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.