For a long time this new ocean was known as the South Sea, and Balboa at once set about exploring the vicinity. The Pearl Islands were located, taken possession of, and named. A later expedition by a less difficult route crossed the Isthmus of Panama and conquered the Indians on the Pearl Islands, bringing back plentiful tribute of fine pearls from the subdued chief. The year following, in 1514, arrived the black villain of the story in the person of Pedrarias, sent out from Spain as governor of Darien. This disturber brought with him two thousand men. Balboa built a fleet of ships on the Atlantic side, took them to pieces, carried them on the backs of Indians across the Isthmus, put them together again, launched them in the waters of the Pacific, and proceeded to explore the coast eastward from Panama. On his return from this trip Balboa was arrested by Pedrarias on a trumped-up charge of treason, and in the forty-second year of his life was beheaded, while declaring his entire innocency of all treachery. Balboa was a product of his age, and of faults he possessed a-plenty, but as one of the great explorers of history his end was a sad reward for the distinguished services that he rendered to the world. [Illustration: EVEN FARM CABINS ARE PICTURESQUE IN COSTA RICA] In 1515 an expedition crossed the Isthmus and camped near the hut of a poor fisherman at a point called by the natives Panama. For this name several explanations are given, one of them being that there were many shellfish at this place. The meaning of the name is now lost, but in 1519 the city of Panama was founded at this point by Pedrarias. Two years later, by order of the Spanish crown, the bishopric, government, and colonists of the Isthmus were transferred from the Atlantic side at Darien to Old Panama. History now began in earnest by the Pacific. In 1525 a priest celebrated in the cathedral at Old Panama solemn mass with two other men, Pizzarro and Almagro, the rite being a solemn vow to conquer all countries lying to the south. For this purpose an expedition was soon organized and sailed away along the west coast of South America. This expedition met with varying fortunes, but in time discovered the long-sought Peru with its splendid temples and golden treasures. The first regular trail across the Isthmus led from Nombre de Dios to Old Panama, crossing the Chagres River at Cruces. Later small boats sailed from Nombre de Dios to the mouth of the Chagres and made their way up to Cruces, where their cargoes were transferred to the backs of horses for the rest of the journey to Panama. Later Nombre de Dios was abandoned for Porto Bello, because of the very good harbor at the latter place. The old trail was "paved" with stones for a part of the way, and the relics of this old road may still be found in a few places amid the tangled growths of the jungle.