Pike conducted two entirely separate and distinct expeditions. One of them, in 1805-6, was from St. Louis by way of the Mississippi to the headwaters of this river, and return--for the most part by the same way he went. This round trip, which I have called the "Mississippi Voyage," forms Pt. 1 of his book. The other expedition was taken westward from St. Louis into the interior parts of the then Louisiana, to the sources of the Arkansaw river, and among the Rocky mountains of present Colorado. In so far as Pike protracted this exploration of his own volition, it forms Pt. 2 of his book, which I have designated the "Arkansaw Journey." But at one point in the course of this journey Pike was captured by the Spaniards, and conducted against his will by a roundabout way through Mexico to the then Spanish-American boundary between Texas and Louisiana. This episode, unflattering to Pike's sensibilities, if not wholly unforeseen by him, he saw fit to make the subject of Pt. 3 of his book; I have entitled it the "Mexican Tour." I. In July, 1805, Pike was ordered by General Wilkinson to explore and report upon the Mississippi river from St. Louis to its source, select sites for military posts, treat with the Indians, make peace if possible between the Sioux and Ojibways, and find out what he could about the British traders who still occupied posts in our newly acquired territory. Excepting these establishments of the Northwest Company, there were then no white settlements on or near the river beyond the village of Prairie du Chien, and our flag had never flown in that quarter. Pike navigated his boats to the vicinity of present Little Falls, but could get them no further. He there built a stockade, in which some of his men were left for the winter, and with the rest pushed on by land along the river to Lower Red Cedar Lake--Sandy lake--Grand rapids and Pokegama falls--mouth of Leech Lake river--up the latter to Leech lake--and thence to Upper Red Cedar (now Cass) lake, at the mouth of Turtle river. This was the furthest point he reached. He considered the Leech Lake drainage-area--which I have called the Pikean source--to be the true origin of the Mississippi, and remained in ignorance of the fact that this river flowed into Cass lake from such lakes as Bemidji and Itasca, though these and others were already known to some of the whites. Returning from Cass to Leech lake, and thence, by a more direct overland route than he had before taken, to the Mississippi in the vicinity of Lower Red Cedar lake, he descended the river to his stockade, picked up the men who had wintered there, and as soon as the ice broke up started in boats for St. Louis, which he reached in safety with all his party in April, 1806.