Columbus now stood to the westward, running along the northern coast of Paria, still supposing it to be an island, intending to visit the Gulf of Pearls. To the north-east he saw the two islands of Tobago and Granada, and on the 15th those of Margarita and Cubagua, afterwards famed for their pearl fishing. On approaching the latter, a number of Indians were seen fishing for pearls. A boat being sent to communicate with them, a seaman offered a broken piece of gaily-painted porcelain to a woman who had round her neck a string of pearls, which she readily gave in exchange. On this the Admiral sent people on shore, who with beads and hawks' bells soon procured three pounds weight of pearls, some of very large size. The coast still trending to the westward, and rising into lofty ranges of mountains, Columbus began to suspect that he was off the mainland of India; but his eyesight failing, he was reluctantly compelled to steer for Hispaniola to seek for needed rest. On making land, after a sail of five days, he found that he was fifty leagues to the westward of his destination, having been driven across by the strong steady current which sets in from the east, and assists to give an impetus to the Gulf Stream. Sending on shore for an Indian messenger to take a letter to his brother the Adelantado, a canoe came off with several Indians, one of whom carried a Spanish crossbow. As this was not an article of traffic, the Admiral feared that fresh troubles had arisen, and that the weapon had fallen into the Indian's hands by the death of a Spaniard. Sailing, he arrived near the mouth of the river on the 30th of August, when a caravel, appeared, on board of which came the Adelantado. The brothers met with mutual joy, but the latter grieved to see the great navigator so broken down in health, a mere wreck of himself, though with his spirit still rising superior to all bodily affliction. Though considerable progress had been made in the building of Isabella, now called San Domingo, at the mouth of the Ozema, the Adelantado had sad accounts to give of the state of the island. Rebellion had been rife among the colonists in all directions. The Indians had been barbarously treated, and all authority had been set at defiance. Attempts had been made to murder the Adelantado, and the leaders had sent home the most serious accusations against him and Columbus and their brother Diego. They had succeeded too well in raising suspicions in the mind of Ferdinand as to the loyalty of Columbus, and an officer of the royal household, Don Francisco de Bobadilla, was sent out nominally to investigate the causes of the rebellion, but with power to arrest the persons and sequestrate the effects of those he might consider guilty; while he was to take upon himself the government of the island, and to demand the surrender of all fortresses, ships, and other royal property.