gions of the said King and Queen of Castilla, Leon,
Aragon, etc., all such lands shall belong to and remain forever in
the possession of the said King and Queen of Castilla, Leon, Aragon,
etc., and their heirs, and the said King of Portugal shall cause such
lands to be surrendered immediately.

_Yten_: In order that the said line or bound of the said division
may be made straight and as nearly as possible the said distance of
three hundred and seventy leagues west of the Cabo Verde islands, as
hereinbefore stated, the said representatives of both the said parties
agree and assent that within the ten months immediately following the
date of this treaty, their said constituent lords shall despatch two
or four caravels, namely, one or two by each one of them, a greater or
less number, as they may mutually consider necessary. These vessels
shall meet at the island of Grande Canaria [Grand Canary Island]
during this time, and each one of the said parties shall send certain
persons in them, to wit, pilots, astrologers, sailors, and any others
they may deem desirable. But there must be as many on one side as on
the other, and certain of the said pilots, astrologers, sailors, and
others of those sent by the said King and Queen of Castilla, Aragon,
etc., and who are experienced, shall embark in the ships of the said
King of Portugal and the Algarbes; in like manner certain of the
said persons sent by the said King of Portugal shall embark in the
ship or ships of the said King and Queen of Castilla, Aragon, etc.:
a like number in each case, so that they may jointly study and examine
to better advantage the sea, courses, winds, and the degrees of the
sun or of north latitude, [162] and lay out the leagues aforesaid,
in order 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 afore