that, in determining the line and boundary, all sent and empowered by both the said parties in the said vessels, shall jointly concur.  These said vessels shall continue their course together to the said Cabo Verde islands, from whence they shall lay a direct course to the west, to the distance of the said three hundred and seventy degrees, measured as the said persons shall agree, and measured without prejudice to the said parts.  When this point is reached, such point will constitute the place and mark for measuring degrees of the sun or of north latitude either by daily runs measured in leagues, or in any other manner that shall mutually be deemed better.  This said line shall be drawn north and south as aforesaid, from the said Arctic pole to the said Antarctic pole.  And when this line has been determined as above said, those sent by each of the aforesaid parties, to whom each one of the said parties must delegate his own authority and power, to determine the said mark and bound, shall draw up a writing concerning it and affix thereto their signatures.  And when determined by the mutual consent of all of them, this line shall be considered forever as a perpetual mark and bound, in such wise that the said parties, or either of them, or their future successors, shall be unable to deny it, or erase or remove it, at any time or in any manner whatsoever.  And should, perchance, the said line and bound from pole to pole, as aforesaid, intersect any island or mainland, 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