"Stone enclosure known as Fort Ridge" (Caldwell county, Kentucky).[41] "Indian mounds ... on 'Indian Hill'" (Hancock county, Kentucky).[42] "A group of circular mounds scattered along a ridge between Fox river and Sugar Creek" (Clark county, Missouri).[43] "Two parallel embankments stretching across a hog-back between two ravines" (Livingston county, New York).[44] "Embankments on Ridge road ... along the edge of the bluff overlooking the Ridge road" (Niagara county, New York).[45] "Cairns on ridges" (Caldwell county, North Carolina).[46] "Stone cairns ... on trail crossing ridge between Tuckasegee river and Alarka Creek" (Swain county, North Carolina).[47] Flint Ridge in Coshocton and Licking counties, Ohio, contained stone and earth mounds and quarries; "Indian trail from Grave Creek mound, West Virginia, to the lakes, passing over Flint Ridge."[48] Some of these remains are undoubtedly of no later age than the Indians whom the first whites knew; many of them are of far earlier times. It is now held by the most prominent archæologists that there are works of the mound-building Indians which do not date back far from the time Columbus discovered America. Thus any work which gives evidence of having been in existence five hundred years may belong to the mound-building era. And throughout all these five hundred years there is hardly a time when there is not evidence of Indian occupation. So the line between the mound-building Indians and the later Indians, among whom the building of mounds was a lost art, is exceedingly hard to draw. [Illustration: EARLY HIGHWAYS ON THE WATERSHEDS OF OHIO] These quotations give some evidence that the builders of our earliest archæological works were well acquainted with the high grounds. It is not apparent now that in any signal instance there exists evidence of a reliable character that any watershed was a highway; all we are seeking to show now is the very general fact that these people lived and moved and had their being often far inland on the heads of the little streams which never in historic times have served the purpose of navigation, and that here many of their works are found on the high grounds where it is sure all previous races have made their roads.