The Grand Banks and other banks of Newfoundland, with the Virgin Rocks and perhaps other piles or pinnacles rising from that bed nearly to the surface so as to be uncovered in some tides; Sable Island, a rather long way offshore; Cape Breton Island and fragments of the main shore--may be held responsible for some map islands such as Arredonda and Dobreton, Jacquet I., Monte Christo, I. de Juan, and Juan de Sampo. There are still other islands mostly north of the latitude of Bermuda and between it and the Azores or northeastern America, but far at sea, of which one can make little, except as probably complimenting some pilot, skipper, or other individual, or commemorating some incident which has nevertheless been generally forgotten. Thus Negra’s Rock, which has hardly ceased to appear on the maps, does not really exist but may keep us in mind, by its rather sinister and mythical sound, that a certain Captain Negra once thought he saw something solid in the great liquid and reported accordingly. Of such origin, perhaps, are I. de Garcia, Y Neufre, Y d’Hyanestienne, Lasciennes, and divers others scattered over various maps and offering no promise of reward for hunting down their pedigrees or history. All these distinctly post-Columbian islands are quite too recent and casual to throw any light on the earlier historically and geographically significant “mythical islands” or on what these reveal. CHAPTER XIII SUMMARY It seems neither practicable nor desirable to recapitulate minutely in this final chapter the rather numerous distinctive features of the present work; but attention may properly be directed to some of its salient conclusions. In stating them positively as below, here or elsewhere, I do not mean to be offensively dogmatic but to present concisely my own deductions from evidence which I have been at some pains to gather. Atlantis was a creation of philosophic romance, incited and aided by miscellaneous data out of history, tradition, and known physical phenomena, especially by rumors of the weed-encumbered windless dead waters of the Sargasso Sea. There never was any such gorgeous and dominant Atlantic power as the Atlantis of Plato, able to overrun and conquer more than half of the Mediterranean and contend with Athens in a struggle of life and death. St. Brendan did not cross the Atlantic nor discover any island in its remoter reaches, where some maps show islands bearing his name. He seems, however, to have visited divers eastern Atlantic islands, now well known; and it is quite likely that most of the portolan maps of the fourteenth and early fifteenth centuries are right in linking his name especially to Madeira and her neighbors.