the said King of Portugal may be; thirty thousand ducats to be paid in Castilla—­twenty thousand at Valhadolid and ten thousand at Sevilla, by the twentieth day of the month of May of this present year; seventy thousand ducats to be paid in Castilla at the May fair of Medina del Campo of this same year, at the terms of the payments of said fair; [199] and the hundred thousand ducats remaining at the October fair at the said town of Medina del Campo of this same year, at the terms of the payment of the same—­all to be paid over and above the rate of exchange.  If necessary, notes will be given for the said time; and, if said emperor and King of Castilla wishes to take in exchange the said hundred thousand ducats at the said May fair of this said year in order to avail himself of their use, he shall pay the said King of Portugal exchange at the rate of five or six per cent, the rate which his treasurer, Hernand Alvarez, is accustomed to exact from fair to fair.  The aforesaid sale is made by the said emperor and king of Castilla to the said King of Portugal on condition that, at whatever time the said emperor and king of Castilla or his successors, should wish to return, and should return, all of the said three hundred and fifty thousand ducats without any shortage to the said King of Portugal or his successors, the said sale becomes null and void and each one of the said sovereigns shall enjoy the right and authority which he now holds and claims to hold, both as regards the right of possession or quasi possession, and as regards the proprietorship, howsoever and in whatever manner they belong to him, as if this contract were not made, and in the manner in which they first held possession and claimed to hold it, and this contract shall cause no prejudice or innovation. Item:  It is covenanted and agreed by the said attorneys, in the names of their said constituents, that, in order to ascertain what islands, places, lands, seas, and their rights and jurisdiction, are sold, henceforth and forever, by the said emperor and king of Castilla, by this contract under the aforesaid condition, to the said King of Portugal, a line must be determined from pole to pole, that is to say, from north to south, by a semicircle extending northeast by east nineteen degrees from Maluquo, to which number of degrees correspond almost seventeen degrees on the equinoctial, amounting to two hundred and ninety-seven and one-half leagues east of the islands of Maluquo, allowing seventeen and one-half leagues to an equinoctial degree.  In this northeast by east meridian and direction are situated the islands of Las Velas and of Santo Thome, through which the said line and semicircle passes.  Since these islands are situated and are distant from Maluquo the said distance, more or less, the deputies determine and agree that the said line be drawn at the said two hundred and ninety-seven and one-half leagues to the east, the equivalent of the nineteen degrees northeast by east from the said islands of