FERRO, (W. Long. 19. N. Lat. 28.), the most westerly of the Canary islands, near the African coast, where the first meridian was lately fixed in most maps; but now, the geographers of almost every kingdom make their respective capitals the first meridian, as we do London. It is a dry and barren spot, affording no water except what is supplied in a very surprising manner by a tree which grows in these islands, called the FOUNTAIN-TREE.