[18] Phys. ii. i, init.

[19] De Anima, init.

[20] Meteor, iv. 1. 378. See Zeller's Aristotle, vol. i, fin.

[21] Polit. 1253 a; Eth. 1162 a.

[22] Gen. An. ii. 3. 737.

IV

PROGRESS IN THE MIDDLE AGES

A. J. Carlyle