Amerigo Vespucci being once more in the service of the king of Castile, in which he obtained the rank of chief pilot, which he held until his death, it was determined to take advantage of his previous discoveries, and in the year 1508 Pinzon and Solis proceeded on an expedition to Cape _St. Augustine_ and thence southwards, taking possession of several points at which they landed, in the name of the king of Spain. As before this date the Pope Alexander VI. had assigned to the Castilian and Lusitanian crowns, respectively, the line beyond which their respective discoveries might in either case be taken possession of, the Portuguese king now complained that the proceedings of this last Spanish expedition on the coast of South America were an infringement of the grant which had been made to him by the Sovereign Pontiff. Notwithstanding this, the king of Castile in the year 1515 despatched Juan de Solis on another expedition to the south, in the hope of finding the means of communication with the ocean which more than a year before this time had been reached overland by Vasco Nuñez de Balboa. This expedition resulted in the discovery of a stream to which Solis gave the name of the Sweet Sea; for the extent of its fresh waters forbade him to entertain the idea of its being a river. The Sweet Sea was named by a subsequent navigator the River of Silver, from the ornaments of that metal found amongst the people on the banks of the _Paraguay_, which flows into the _Paraná_, which with the _Uruguay_ forms the _Plata_, and is now known to us as the _Plata_ or the River _Plate_. This discovery cost De Solis his life; for, having landed incautiously on the island of _Martin Garcia_, he was set upon by the natives and murdered. [Sidenote: 1519.] And here it is necessary to mention the great navigator who should rank next to Columbus in South American discovery. Fernando Magalhaens (in Spanish Magallanes), better known as Magellan, was born in Oporto late in the fifteenth century. He entered the Portuguese navy at the usual early age, and served in India under Albuquerque. Fancying that his merits at _Malacca_ had been overlooked, he retired from the service of Portugal, and made proposals for new discoveries to Cardinal Ximenes. He shared the view of Columbus that there must exist somewhere a western passage to the seas beyond America, which seas had been seen by Vasco Nuñez de Balboa. Having held out the inducement of obtaining the _Moluccas_ by sailing westward, inasmuch as by the compact between Spain and Portugal all countries discovered 180° west of the _Azores_ were to belong to the former country, he obtained a fleet of five vessels, manned by two hundred and thirty-four persons, which sailed from Seville under his command on August 10th, 1519.