Nothing is of more interest in the great Government expedition of exploration which President Jefferson now sent into the unknown territory beyond the Mississippi than this very fact of vital connection between the leaders of the former movement into the eastern half of the Mississippi Basin and this present movement into its tremendous western half. In a previous story we have shown that the founders of the old Northwest were largely heroes of the French and Indian and the Revolutionary wars; it is now interesting indeed to note that these leaders in Far Western exploration--Meriwether Lewis and William Clark--were in turn heroes of the British and Indian wars, both of them survivors of bloody Fallen Timber, where, on the cyclone's path, Anthony Wayne's hard-trained soldiers made sure that Indian hostility was never again to be a national menace on the American continent. [Illustration: MERIWETHER LEWIS _Of the Lewis and Clark Expedition_] The proposed exploration of Louisiana by Lewis and Clark is interesting also as the first scientific expedition ever promoted by the American Government. For it was a tour of exploration only; the party did not carry leaden plates such as Céloron de Bienville brought fifty years back in those days of gold interwoven with purple, to bury along the tributaries of the Ohio as a claim to land for his royal master and the mistresses of France. There was here no question of possession; Lewis and Clark were, on the contrary, to report on the geography, physiography, and zoölogy of the land, designate proper sites for trading stations, and give an account of the Indian nations. It is remarkable that little was known of Louisiana on these heads. Of course the continent had been crossed, though not by way of the Missouri River route, which had become the great highway for the fur trade. Mackenzie had crossed the continent in the Far North, and Hearne had passed over the Barren Grounds just under the Arctic Circle. To the southward from the Missouri the Spaniards had run to and from the Pacific for two centuries. The commanding position of St. Louis showed that the Missouri route was of utmost importance; the portage to the half-known Columbia was of strategic value, and a knowledge of that river indispensable to sane plans, commercial and political, in the future. In May, 1804, the explorers were ready to start from St. Louis. They numbered twenty-seven men and the two leading spirits, Lewis and Clark; fourteen of the number were regular soldiers from the United States army; there were nine adventurous volunteers from Kentucky; a half-breed interpreter; two French voyageurs and Clark's negro servant completed the roster. The party was increased by the addition of sixteen men, soldiers and traders, whose destination was the Mandan villages on the Missouri, where the explorers proposed to spend the first Winter.