In previous articles I have called attention to the fact that on the four or five Shawano sites in the State of Ohio, there were large bodies of Indians assembled during the period embraced between (roughly) 1700 and 1812. These Indians helped to make American history. They were fairly numerous, of unquestioned ability, and produced such men as Tecumseh and his brother the Prophet. Their leaders, Tecumseh and Cornstalk, were engaged in twenty-two actions with our troops; numerous traders were among them, and they sent many expeditions against the frontiers. Yet, if one walks over these populous sites of historic times, one finds practically nothing save here and there a glass bead or a broken tomahawk. In any one of perhaps two or three hundred places where prehistoric villages occurred, an observer may find great quantities of chips, spawls, broken implements, broken pottery, etc. The needs of ancient man were few, his implements simple and confined to the types illustrated in this work. Therefore, the presence of the unnumbered evidences of human residence indicates either a great length of occupation, or large numbers of Indians for a short period of time. I never believed that the population in America exceeded one million (north of Mexico) at any time, assuming that the field evidence is against the statement so often made that there are as many Indians in America to-day as at the time of the discovery. If the Ohio Valley had been occupied by mound-building people when La Salle and Hennepin made their voyages of discovery, these worthy and zealous explorers would have made reference to it in their reports. But La Salle and Hennepin heard of the great Illinois towns on the river of the same name in that state and journeyed from Quebec to visit those towns. There were thousands of Indians living in the Illinois country, but Ohio appears to have had little population—that is of Indians, and none whatsoever of mound-building people. Between Aurora and Lawrenceburg, Indiana, if the Ohio River has not during a recent flood covered the bottoms with silt, there may be seen a village-site nearly three miles in extent. I visited it in 1898 and collected upwards of three thousand specimens from the surface in a week’s time. The Indian population was most numerous on that great artery, the Mississippi River and its tributaries. Perhaps we have not fully recognized the importance played by this “Father of Waters” in prehistoric times. Throughout the Mississippi Valley are several climates varying from extreme cold in northern Minnesota to the semi-tropical of Louisiana; from the aridity of the foothills of the Rocky Mountains to the salubrious climate of Tennessee; from the cold of the extreme Northwest to that of Pennsylvania. The Mississippi Valley comprises altitude and sea level, mountains and plains, every kind of soil and every specimen of plant and animal life found in North America above the City of Mexico.