- The farthest land known to the west was the Azores; beyond that stretched a vague and impossible ocean of terror and darkness, of which the Arabian writer Xerif al Edrisi, whose countrymen were the sea- kings of the Middle Ages, wrote as follows: " The ocean encircles the ultimate bounds of the inhabited earth, and all beyond it is unknown. - "Christopher Columbus, Complete", Filson Young.
- Xerif al Edrizi, his description of the Atlantic. - "The Life and Voyages of Christopher Columbus (Vol. II)", Washington Irving.