This districting is to be regarded as a working hypothesis rather than as a settled conclusion which will stand the test of future investigations. It is more than likely that other subdivisions will be found necessary, and that the boundaries of some of the districts given will have to be more or less modified; still, I believe the arrangement will be found substantially correct. As a very general and almost universal rule, mounds of the class under consideration are more or less conical in form, and are common to all sections where earthworks are known to exist, in fact they form almost the only ancient remains of some localities. Often they are isolated, with no other monuments near them, but more frequently they occur in groups or are associated with other works. Squier and Davis say "they are generally of considerable size, varying from 6 to 80 feet in height, but having an average of from 15 to 25 feet."[1] This is probably true in regard to the mounds explored by these archaeologists in Ohio, but is erroneous if applied generally; as very many, evidently used and intended as burying places only, are but two or three feet high, and so far as the more recent examinations made in other sections--especially the explorations carried on under the Bureau of Ethnology--have shown, tumuli of this character are usually from 3 to 10 feet high, though some, it is true, are of much larger dimensions; but these are the exceptions and not the rule.[2] As the authors just alluded to are so frequently referred to by writers, and their statements in reference to the works explored by them are taken as of general application, I will venture to correct another statement made by them in regard to mounds of this character. They assert that "these mounds invariably cover a single skeleton (in very rare instances more than one, as in the case of the Grave Creek mound), which, at the time of its interment, was enveloped in bark or coarse matting or enclosed in a rude sarcophagus of timber, the traces, in some instances the very casts, of which remain. Occasionally the chamber of the dead is built of stone rudely laid up, without cement of any kind."[3] I have investigated but few of the ancient works of Ohio personally, or through the assistants of the Bureau, hence I can only speak in regard to them from what has been published and from communications received, but judging from these, Messrs. Squier and Davis, while no doubt correctly describing the mounds explored by them, have been too hasty in drawing general conclusions. That burial mounds in the northern sections very frequently cover but a single skeleton is true, but that this, even in this section, is universally true or that it is the general rule is a mistake, as will appear from what is shown hereafter. Nor will it apply as a rule to those of the southern sections.