that the soul is immortal, that by transmigration it puts on many bodies,* and that it has a numerical first principle, whereas the first principle of the body is geometrical ®; and he defined soul as the idea of vital breath diffused in all directions. He held that it is self-moved and tripartite, the rational part of it having its seat in the head, the passionate part about the heart, while the appetitive is placed in the region of the navel and the liver.¢ . And from the centre outwards it encloses the body — CE — — — on all sides in a circle, and is compounded of elements, and, being divided at harmonic intervals, it forms two circles which touch one another twice ; and the interior circle, being slit six times over, makes seven circles in all. And this interior circle moves by way of the diagonal to the left, and the other by way of _ the side to the right. Hence also the one is supreme, being a single circle, for the other interior circle was divided ; the former is the circle of the Same, the latter that of the Other, whereby he means that the motion of the soul is the motion of the universe together with the revolutions of the planets.? And the division from the centre to the circumference which is adjusted in harmony with the soul being thus determined, the soul knows that which is, and adjusts it proportionately because she has the elements proportionately disposed in herself. And when the circle of the Other revolves aright, the result is opinion; but from the regular motion of the circle of the Same comes knowledge. He set forth two universal principles, God and matter, and he calls God mind and cause; he held that matter is devoid of form and unlimited, and that composite things arise out of it®; and that it was once in