It was not long before the Yankee _régime_ confirmed Boone's fears. The tide of immigration crossed the river, and rolling westward again passed the door of the great Kentuckian, driving off the game and monopolizing the hunting-grounds. Laws, courts, politics, speculation, and improvements were being talked about, to the bewilderment of the French and the unconcealed disgust of the former syndic. Despite his great age, he talked strongly of moving still farther West, hoping to get beyond the reach of settlement; but his sons and neighbors persuaded him against it, and he was obliged to accommodate himself as best he might to the new conditions. In summer he would work on the now substantial and prosperous farms of his children, chopping trees for the winter's wood. But at the advent of autumn the spirit of restlessness seized him, when he would take his canoe, with some relative or his Indian servant, and disappear up the Missouri and its branches for weeks together. In 1816, we hear of him as being at Fort Osage, on his way to the Platte, "in the dress of the roughest, poorest hunter." Two years later, he writes to his son Daniel M.: "I intend by next autumn to take two or three whites and a party of Osage Indians to visit the salt mountains, lakes, and ponds and see these natural curiosities. They are about five or six hundred miles west of here"--presumably the rock salt in Indian Territory; it is not known whether this trip was taken. He was greatly interested in Rocky Mountain exploration, then much talked of, and eagerly sought information regarding California; and was the cause of several young men migrating thither. A tale of new lands ever found in him a delighted listener. In these his declining years, although he had suffered much at the hands of the world, Boone's temperament, always kindly, mellowed in tone. Decay came gradually, without palsy or pain; and, amid kind friends and an admiring public, his days passed in tranquillity. The following letter written by him at this period to his sister-in-law Sarah (Day) Boone, wife of his brother Samuel, is characteristic of the man, and gives to us, moreover, probably the only reliable account we possess of his religious views: "october the 19th 1816 "Deer Sister