11. Compare the eastern limits of the Arabian Empire with those of Alexander's empire (maps facing pages 124, 376).
12. Show that the Arabian Empire, because of its geographical position, was less easily defended than the Roman Empire.
13. Locate on the map facing page 376 the following commercial cities in the Arabian Empire: Samarkand; Cabul; Bokhara; Mosul; Kairwan; Fez; Seville; and Toledo.
14. Can you suggest any reason why the Arabs did little in painting and sculpture?
15. What are some of the best-known stories in the Thousand and One Nights?
16. Discuss the justice of this statement: "If our ideas and our arts go back to antiquity, all the inventions which make life easy and agreeable come to us from the Arabs."
17. "From the eighth to the twelfth century the world knew but two civilizations, that of Byzantium and that of the Arabs." Comment on this statement.
18. Show that Islam was an heir to the Graeco-Oriental civilization.
19. Can you suggest any reasons why Islam to-day spreads among the African negroes more rapidly than Christianity?
20. How does Islam, by sanctioning polygamy and slavery, hinder the rise of women and of the working classes?