The quarrel at length became so bad that Penn went home to England to have the matter settled; after that for a time things were better, but the quarrel was not really settled. It was not settled until many years after both Penn and Lord Baltimore were dead. Then, in 1767, two English astronomers, Charles Mason and Jeremiah Dixon, surveyed and fixed the boundary which ever since has been known as the Mason and Dixon Line. Every mile a small stone was placed with B on one side and P on the other. Along the eastern part, too, every five miles a larger stone was placed with the arms of Penn on one side and those of Baltimore on the other. But further west these were discontinued. For in those days when there were few roads it was difficult to get these heavy stones carried to the proper places. When Penn went back to England he had meant to return to his colony very soon. But fifteen years passed before be was able to do so. During this time King Charles II, who had given him the charter for his great Possessions, died, and his brother James, who as Duke of York had been Penn's friend, was driven from the throne. Then for a time Penn's great province was taken from him, because he was suspected of helping his old friend, the dethroned king. The colony was then placed under the control of the Governor of New York. Two years later, however, Penn was cleared from the charge of treason and his right to Pennsylvania was again recognised. Then once more he crossed the seas to visit his possessions in the New World. He found that in fifteen years great changes had been wrought. The two or three thousand inhabitants had now increased to twenty thousand. Many of the new settlers were not Quakers but Protestants from Germany, Holland and Sweden, and Presbyterians from Scotland and Ireland. Penn welcomed them all, but they on their side had grown apart from him. They were no longer his children. He was no longer Father Penn, but the Governor and proprietor. From this Governor the settlers demanded greater liberties than they had. Penn was grieved, but he met the clamour in the most generous spirit. "Friends," he said, "if in the constitution there be anything that jars, alter it." So it was altered until practically the colonists became a self-governing people. Now for a second time Penn felt himself obliged to return to England. He did not want to go, but longed to live out the rest of his life in his colony which, in spite of all troubles and difficulties, be loved dearly. "I cannot think of such a voyage without great reluctance," he said. "For I promised myself that I might stay so long, at least, with you, as to render everybody entirely easy and safe. For my heart is among you, as well as my body, whatever some people may please to think. And no unkindness or disappointment shall ever be able to alter my love to the country."