at the first point of such intersection of such island or mainland by the said line, some kind of mark or tower shall be erected, and a succession of similar marks shall be erected in a straight line from such mark or tower, in a line identical with the above-mentioned bound. These marks shall separate those portions of such land belonging to each one of the said parties; and the subjects of the said parties shall not dare, on either side, to enter the territory of the other, by crossing the said mark or bound in such island or mainland. _Yten_: Inasmuch as the said ships of the said King and Queen of Castilla, Leon, Aragon, etc., sailing as before declared, from their kingdoms and seigniories to their said possessions on the other side of the said line, must cross the seas on this side of the line, pertaining to the said King of Portugal, it is therefore concerted and agreed that the said ships of the said King and Queen of Castilla, Leon, Aragon, etc., shall, at any time and without any hindrance, sail in either direction, freely, securely, and peacefully, over the said seas of the said King of Portugal, and within the said line. And whenever their Highnesses and their successors wish to do so, and deem it expedient, their said ships may take their courses and routes direct from their kingdoms to any region within their line and bound to which they desire to despatch expeditions of discovery, conquest, and trade. They shall take their courses direct to the desired region and for any purpose desired therein, and shall not leave their course, unless compelled to do so by contrary weather. They shall do this provided that, before crossing the said line, they shall not seize or take possession of anything discovered in his said region by the said King of Portugal; and should their said ships find anything before crossing the said line, as aforesaid, it shall belong to the said King of Portugal, and their Highnesses shall order it surrendered immediately. And since it is possible that the ships and subjects of the said King and Queen of Castilla, Leon, etc., or those acting in their name, may discover within the next twenty days of this present month of June following the date of this treaty, some islands and mainlands within the said line, drawn straight from pole to pole, that is to say, inside the said three hundred and seventy leagues west of the Cabo Verde islands, as aforesaid, it is hereby agreed and determined, in order to remove all doubt, that all such islands and mainlands found and discovered in any manner whatsoever up to the said twentieth day of this said month of June, although found by ships and subjects of the said King and Queen of Castylla, Aragon, etc., shall pertain to and remain forever in the possession of the said King of Portugal and the Algarbes, and of his successors and kingdoms, provided that they lie within the first two hundred and fifty leagues of the said three hundred and seventy leagues reckoned west of the