Socrates, Frontispiece

Map showing where the Cosmologists lived, 21

The Empire of Alexander, 205

Map of Athens showing the Location of the Four Schools, 219

Ptolemaic Cosmography showing the Division of the Universe into Spheres, 323

Ptolemaic Cosmography showing the Epicyclic Movements of the Planets, 325

MediÆval Geography. The Cosmas Map, A.D.547, 335

Growth of Mohammedanism during the Middle Ages, showing its Contact with Christian Civilization, 370

Diagram of Dante’s Poetic Conception of the Universe, 376