The structure, not less than the form and position of a large number of the Earthworks of the West, and especially of the Scioto valley, render it clear that they were erected for other than defensive purposes. The small dimensions of most of the circles, the occurrence of the ditch interior to the embankments, and the fact that many of them are completely commanded by adjacent heights, are some of the circumstances which may be mentioned as sustaining this conclusion. We must seek, therefore, in the connection in which these works are found and in the character of the mounds, if such there be within their walls, for the secret of their origin. And it may be observed that it is here we discover evidences still more satisfactory and conclusive than are furnished by their small dimensions and other circumstances above mentioned, that they were not intended for defence. Thus, when we find an enclosure containing a number of mounds, all of which it is capable of demonstration were religious in their purposes or in some way connected with the superstitions of the people who built them, the conclusion is irresistible that the enclosure itself was also deemed sacred and thus set apart as "tabooed" or consecrated ground--especially where it is obvious at the first glance that it possesses none of the requisites of a military work. But it is not to be concluded that those enclosures alone, which contain mounds of the description here named, were designed for sacred purposes. We have reason to believe that the religious system of the mound builders, like that of the Aztecs, exercised among them a great if not controlling influence. Their government may have been, for aught we know, a government of priesthood; one in which the priestly and civil functions were jointly exercised, and one sufficiently powerful to have secured in the Mississippi valley, as it did in Mexico, the erection of many of those vast monuments which for ages will continue to challenge the wonder of men. There may have been certain superstitious ceremonies, having no connection with the purposes of the mounds, carried on in the enclosures specially dedicated to them. It is a conclusion which every day's investigation and observation has tended to confirm, that most, perhaps all, of the earthworks not manifestly defensive in their character were in some way connected with the superstitious rights of the builders, though in what manner, it is, and perhaps ever will be, impossible satisfactorily to determine.