On the 23rd of August, after having at the expense of much danger and fatigue, overcome the perils of this bay, Columbus issued from the Gulf of Paria by the narrow strait to which he gave the name, retained to this day, of the Dragon's Mouth. Arrived in the open sea, the Spaniards discovered the Island of Tobago situated to the north-east of Trinidad, and then, more to the north, the Island of Conception, now known as Grenada. They next steered to the south-west and returned towards the American coast; after sailing along which for 120 miles, they discovered, on the 25th of August, the populous Island of Margarita, and afterwards the Island of Cubaga, situated very close to the mainland. At this place the natives had established a pearl-fishery, and busied themselves in collecting this valuable product. Columbus sent a boat on shore, when a very profitable traffic was carried on, the natives giving in exchange for broken pottery or hawks' bells, pounds' weight of pearls, some of which were very large, and of the finest water. [Illustration: Pearl-fishers.] The admiral stopped at this point of his discoveries; the temptation was strong to explore this country, but both officers and crews were exhausted. Orders were therefore given to start for San Domingo, where matters of the gravest moment demanded the presence of Columbus. Before his departure from Hispaniola he had authorized his brother to lay the foundations of a new town. With this end Don Bartolomeo had explored the different portions of the island, and having discovered at the distance of 150 miles from Isabella a magnificent harbour at the mouth of a fine river, he there marked out the first streets of a town which became later on the city of San Domingo. Here Don Bartolomeo fixed his residence, while Don Diego remained as Governor of Isabella. By this arrangement Columbus' two brothers had the whole administration of the colony in their hands. But there were many malcontents who were ready to revolt against their authority, and it was while this bad spirit was abroad that the admiral arrived at San Domingo. He approved of all that his brothers had done, their administration having been in fact, marked by great wisdom, and he published a proclamation recalling to their obedience the Spaniards who had revolted. On the 18th of October he despatched five ships to Spain, and with them an officer commissioned to inform the king of the new discoveries, and of the state of the colony, endangered by the fomenters of disorder.