The treaty gave the new colony a substantial advantage. The Lenni Lenape, the Mingoes, the Shawnees accounted Penn's settlers as their friends. The word went out among the tribes that what Penn said he meant, and that what he promised he would fulfill faithfully. Thus the planters were freed from the terror of the forest which haunted their neighbors, north and south. They could found cities in the wilderness and till their scattered farms without fear of tomahawk or firebrand. Penn himself went twenty miles from Philadelphia, near the present Bristol, to lay out his country place of Pennsbury. Ships were now arriving with sober and industrious emigrants; trees were coming down, houses were going up. In July, 1683, Penn wrote to Henry Sidney, in England, reminding him that he had promised to send some fruit-trees, and describing the condition of the colony. "We have laid out a town a mile long and two miles deep.... I think we have near about eighty houses built, and about three hundred farms settled round the town.... We have had fifty sail of ships and small vessels, since the last summer, in our river, which shows a good beginning." "I am mightily taken with this part of the world," he wrote to Lord Culpeper, who had come to be governor of Virginia, "I like it so well, that a plentiful estate, and a great acquaintance on the other side, have no charms to remove; my family being once fixed with me, and if no other thing occur, I am likely to be an adopted American." "Our heads are dull," he added, "but our hearts are good and our hands strong." In the midst of this peace and prosperity, however, there was a serious trouble. This was a dispute with Lord Baltimore over the dividing line between Pennsylvania and Maryland. By the inaccuracy of surveyors, the confusion of maps, and the indefiniteness of charters, Baltimore believed himself entitled to a considerable part of the territory which was claimed by Penn, including even Philadelphia. The two proprietors had already discussed the question without settlement; indeed, it remained a cause of contention for some seventy years. As finally settled, in 1732, between the heirs of Penn and of Baltimore, a line was established from Cape Henlopen west to a point half way between Delaware Bay and Chesapeake Bay; thence north to twelve miles west of Newcastle, and so on to fifteen miles south of Philadelphia; thence due west. The surveyors were Charles Mason and Jeremiah Dixon, and the line was thus called Mason and Dixon's Line. This boundary afterwards parted the free States from the slave States. South of it was "Dixie."