For these Reasons, I am inclined to believe that the Naval power of the Britons was considerable before the coming of the Romans. As to succeeding Times, when the Britons were driven into Wales, a Country with an extensive Sea Coast, they had little to subsist upon, but a scanty Agriculture, and rich Fisheries; so that very great Numbers of them were compelled by necessity to pursue a Seafaring Life. The strongest objection to the Truth of this Event, which is urged by his Lordship and by others, is the great Improbability that such a Voyage could be performed without the assistance of the Mariner's Compass, not then discovered. This Discovery was made about the Year, 1300; others say, by Behain above mentioned, above 100 Years later. In answer to this Objection, it may be observed that previously to Madog's Voyage we read of several others, which appear to me full as improbable. It is generally understood that the Phoenicians, Grecians, &c. were acquainted with, and sailed to Britain, and other Countries, for Tin and Lead, and unto the Baltic Sea for Amber; Voyages which seen as difficult as that of Madog's, and a longer Navigation. It was hardly possible for the Britons, not to learn how to navigate Ships, when they saw how it was done by others. The return of our Prince to North Wales, and back again to his Colony, is the most difficult to be accounted for, in the whole Story: However, I apprehend, that this is not altogether impossible. Let it be observed that the space of Time in which there Voyages of Madag's were performed is no where mentioned. They might have taken up twenty Years or more. Madog, on his return to Wales, might have sailed Northward by the American Coast, till he came to a situation where the light of the Sun at Noon was the same, at that Season, as it was in his Native Country, and then sailing Eastward (the Polar Star, long before observed would prevent his sailing on a wrong point) he might safely return to Britain. The experience he derived from his first Voyage would enable him to join his Companions whom he had left behind. That there are strong Currents in the Atlantic Ocean, is well known. On his return to North Wales, Madog might fall into that Current, which it is said, runs from the West Indian Islands Northward to Cape Sable in Nova Scotia, where interrupted by the Land, it runs Eastward towards Britain. There is a Tradition that a Captain of a Ship dined at Boston, in New England, on a Sunday, and on the following Sunday, dined at his own House, in Penzance, Cornwall. This is by no means impossible; for with favourable Winds and strong Currents, a Ship may run above 14 miles in an Hour.