A vast empire lay to the south, they said, "so rich in gold, that even the commonest instruments were made of it," where the domestic animals were llamas that had been tamed and trained to carry heavy burdens, and whose appearance in the native drawings resembled that of the camel. These interesting details, and the great quantity of pearls offered to Balboa, confirmed him in his idea, that he must have reached the Asiatic countries described by Marco Polo, and that he could not be far from the empire of Cipango or Japan, of which the Venetian traveller had described the marvellous riches which were perpetually dazzling the eyes of these avaricious adventurers. [Illustration: Balboa discovering the Pacific Ocean.] Balboa several times crossed the Isthmus of Darien, and always in some fresh direction. Humboldt might well say that this country was better known in the beginning of the sixteenth century than in his own day. Beyond this Balboa had launched some vessels built under his orders on the newly-discovered ocean, and he was preparing a formidable armament, with which he hoped to conquer Peru, when he was odiously and judicially murdered by the orders of Pedrarias Davila, the governor of Darien, who was jealous of the reputation Balboa had already gained, and of the glory which would doubtless recompense his bravery if he carried out the expedition which he had arranged. Thus the conquest of Peru was retarded by at least twenty-five years, owing to the culpable jealousy of a man whose name has acquired, by Balboa's assassination, almost as wretched a celebrity as that of Erostratus. If we owe to Balboa the first authentic documents regarding Peru, another explorer was destined to furnish some not less important touching that vast Mexican Empire, which had extended its sway over almost the whole of Central America. In 1518, Juan de Grijalva had been placed in command of a flotilla, consisting of four vessels, armed by Diego Velasquez, the conqueror of Cuba, which were destined to collect information upon Yucatan, sighted the year before by Hernandez de Cordova. Grijalva, accompanied by the pilot Alaminos, who had made the voyage to Florida with Ponce de Leon, had two hundred men under his command; amongst the volunteers was Bernal Diaz del Castillo, the clever author of a very interesting history of the conquest of Mexico, from which we shall borrow freely.