It is not necessary to go into further details regarding this primitive commerce of the prairies. It yielded a certain profit; it shaped the character of the men who carried it on. But what is yet more important, it greatly influenced the country which lay back of the border on the Missouri River. It called yet more men from the eastern settlements to those portions which lay upon the edge of the Great Plains. There crowded yet more thickly, up to the line between the certain and the uncertain, the restless westbound population of all the country. If on the south the valley of the Arkansas led outward to New Spain, yet other pathways made out from the Mississippi River into the unknown lands. The Missouri was the first and last of our great natural frontier roads. Its lower course swept along the eastern edge of the Plains, far to the south, down to the very doors of the most adventurous settlements in the Mississippi Valley. Those who dared its stained and turbulent current had to push up, onward, northward, past the mouth of the Platte, far to the north across degrees of latitude, steadily forward through a vast virgin land. Then the river bent boldly and strongly off to the west, across another empire. Its great falls indicated that it headed high; beyond the great falls its steady sweep westward and at last southward, led into yet other kingdoms. When we travel by horse or by modern motor car in that now accessible region and look about us, we should not fail to reflect on the long trail of the upbound boats which Manuel Lisa and other traders sent out almost immediately upon the return of the Lewis and Clark expedition. We should see them struggling up against that tremendous current before steam was known, driven by their lust for new lands. We may then understand fully what we have read of the enterprises of the old American Fur Company, and bring to mind the forgotten names of Campbell and Sublette, of General Ashley and of Wyeth--names to be followed by others really of less importance, as those of Bonneville and Fremont. That there could be farms, that there ever might be homes, in this strange wild country, was, to these early adventurers, unthinkable. Then we should picture the millions of buffalo which once covered these plains and think of the waste and folly of their slaughtering. We should see the long streams of the Mackinaw boats swimming down the Missouri, bound for St. Louis, laden with bales of buffalo and beaver peltry, every pound of which would be worth ten dollars at the capital of the fur trade; and we should restore to our minds the old pictures of savage tribesmen, decked in fur-trimmed war-shirts and plumed bonnets, armed with lance and sinewed bow and bull-neck shield, not forgetting whence they got their horses and how they got their food.