himself,—­a like number on either side—­shall be in the island of La Gran Canaria, in order to proceed to the determination and drawing of the divisional line of the said sea—­which must be three hundred and seventy leagues west of the Cabo Verde islands, in a straight north and south line from the Arctic to the Antarctic pole, as covenanted between us by the said treaty of the division of the said sea, as is more fully set forth therein;—­and inasmuch as we now consider that the line of the said division at the distance of the said three hundred and seventy leagues can be determined and calculated better, if the said astrologers, pilots, sailors, and others, come to a definite conclusion and agreement regarding the manner and order of procedure to be observed in the determination and marking of the said line, before the sailing of the said caravels, by so doing avoiding disputes and controversies that might arise regarding it among those going, if these had to be arranged after the departure; and inasmuch as it would be quite useless for the said caravels and persons to go before knowing that any island or mainland had been found in each one of the said parts of the said sea, and to which they must proceed immediately and orderly:  Now therefore, in order that all this may be done to better advantage, and with the full and free consent of both sides, we agree and by this present letter consent that the said astrologers, pilots, sailors, and others determined upon with the said King, our brother—­a like number on either side, and of sufficient number for this matter—­must assemble and they shall assemble along any part of the frontier of these our Kingdoms and the Kingdom of Portugal.  During the whole month of July first following the date of this letter these men shall consult upon, covenant concerning, and determine the manner of making the said divisional line of the said sea at the distance of the said three hundred and seventy leagues west of the said Cabo Verde islands, by means of a straight north and south line from the Arctic to the Antarctic Pole, as is set forth in the said treaty.  And whatever they determine upon, unanimously, and whatever is concluded and marked out by them, shall be approved and confirmed through our letters-patent, by us and by the said King, our brother.  And if after the said astrologers, pilots, and sailors, appointed as above said, shall have arrived at a conclusion, each one of the said parties going to that part of the said sea, according to the permission of the said treaty, and thereby observing the contents of said treaty, any island or mainland shall be found hereafter, which either of the parties consider to be so situated that the said line can be determined in accordance with the stipulations of the said treaty, and the one party shall cause notification to be given the other party that they shall cause the line abovesaid to be marked out, we and the said King, our brother, shall be obliged to have the said line determined