A very large proportion of the old structures in Ohio and farther south called “mounds,” namely, those which are low in proportion to their horizontal extent, are terraced foundations for buildings, and if they were situated in Yucatan, Guatemala, and Southern Mexico, they would never be mistaken for any thing else. The high mounds also in the two regions are remarkably alike. In both cases they are pyramidal in shape, and have level summits of considerable extent, which were reached by means of stairways on the outside. The great mound at Chichen-Itza is 75 feet high, and has on its summit a ruined stone edifice; that at Uxmal is 60 feet high, and has a similar ruin on its summit; that at Mayapan is 60 feet high; the edifice placed on its summit has disappeared. The great mound at Miamisburg, Ohio, is 68 feet high; and that at Grave Creek, West Virginia, is 75 feet high. Both had level summits, and stairways on the outside, but no trace of any structure remains on them. All these mounds were constructed for religious uses, and they are, in their way, as much alike as any five Gothic churches. Could these works of the Mound-Builders be restored to the condition in which they were when the country was filled with their busy communities, we should doubtless see great edifices, similar in style to those in Yucatan, standing on the upper terraces of all the low and extended “mounds,” and smaller structures on the high mounds, such as those above named. There would seem to be an extension of ancient Mexico and Central America through Texas into the Mississippi and Ohio valleys; and so, if there were no massive stone-work in the old ruins of those countries, it might seem that the Mound-Builders’ works were anciently extended into them by way of Texas. The fact that the settlements and works of the Mound-Builders extended through Texas and across the Rio Grande indicates very plainly their connection with the people of Mexico, and goes far to explain their origin. We have other evidence of intercourse between the two peoples; for the obsidian dug from the mounds, and perhaps the porphyry also, can be explained only by supposing commercial relations between them. We can not suppose the Mound-Builders to have come from any other part of North America, for nowhere else north of the Isthmus was there any other people capable of producing such works as they left in the places where they dwelt. Beyond the relics of the Mound-Builders themselves, no traces of the former existence of such a people have been discovered in any part of North America save Mexico, and Central America, and districts immediately connected with them. At the same time, it is not unreasonable to suppose the civilized people of these regions extended their settlements through Texas, and also migrated across the Gulf into the Mississippi Valley. In fact, the connection of settlements by way of Texas appears to have been unbroken from Ohio to Mexico.