Paul left Mr. Younger's service in 1766 and acquired a sixth interest in a ship called King George's Packet, in which he went, as first mate, to the West Indies. The business instinct, always strong in him, received some satisfaction during this voyage by the transportation of blacks from Africa to Jamaica, where they were sold as slaves. The slave-trade was not regarded at that time as dishonorable, but Jones's eagerness to engage in "any private enterprise"--a phrase constantly used by him--was not accompanied by any keen moral sensitiveness. He was always in pursuit of private gain or immediate or posthumous honor, and his grand sentiments, of which he had many, were largely histrionic in type. After one more voyage he gave up the slave-trading business, probably because he realized that no real advancement lay in that line. On the John O'Gaunt, in which Jones shipped for England, after leaving Jamaica, the captain, mate, and all but five of the crew died of yellow fever, and the ship was taken by Paul into Whitehaven. For this he received a share in the cargo, and in 1768, when he was twenty-one years old, the owners of the John (a merchantman sailing from the same port) gave him command, and in her he made several voyages to America. Life on a merchantman is rough enough to-day, and was still rougher at that time. To maintain discipline at sea requires a strong hand and a not too gentle tongue, and Jones was fully equipped in these necessaries. During the third voyage of the John, when fever had greatly reduced the crew, Mungo Maxwell, a Jamaica mulatto, became mutinous, and Jones knocked him down with a belaying pin. Jones satisfactorily cleared himself of the resulting charge of murder, and gave, during the trial, one of the earliest evidences of his power to express himself almost as clearly and strongly in speech as in action.