[15] Aristotle, Met. v. 4.
[16] Aristotle, Met. xii. 2.
[17] Aristotle, Met. vii. 8.
[18] Aristotle, de Anima, ii. 5.
[19] Aristotle, Met. xii. 5.
[20] Aristotle, Met. ix. 8.
[21] Aristotle, Met. ix. 5.
[22] That is, their producing potentiality, and not the potentiality of becoming these things, as thought Aristotle. Met. ix. 2.
[23] As thought Aristotle, Soul, iii. 7; Met. xii.
[24] By Plato in the Timaeus 52.