Translation and edition. The additional documents, in translation, comprise a letter by Antoine Malfante, 1447, an account of the voyages of Diogo Gomes, c. 1456, and extracts from João de Barros, Decadas de Asia. This is a new print-on-demand hardback edition of the volume first published in 1937. Owing to technical constraints it has not been possible to reproduce the map of "North-western Africa in the fifteenth century" which appeared in the first edition of the work.