III. The uses for which their principal earth-works were designed, with a conjectural restoration of one of their pueblos; and,
IV. The probable numbers of the people.
The Mound-Builders have disappeared, or, at least, have fallen out of human knowledge, leaving these works and their fabrics as the only evidence of their existence. Consequently the proposed questions, excepting the first, are incapable of specific answers; but they are not beyond the reach of approximate solutions. The mystery in which these tribes are enshrouded, and the unique character of their earth-works, will lead to deceptive inferences, unless facts and principles are carefully considered and rigorously applied, and such deductions only are made as they will fairly warrant. It is easy to magnify the significance of these remains and to form extravagant conclusions concerning them; but neither will advance the truth. They represent a status of human advancement forming a connecting link in the progressive development of man. If, then, the nature of their arts, and more especially the character of their institutions, can be determined with reasonable certainty, the true position of the Mound-Builders can be assigned to them in the scale of human progress, and what was possible and what impossible on their part can be known.
THE HOUSE-LIFE OF THE AMERICAN ABORIGINES, IN THE USAGES OF WHICH THE MOUND-BUILDERS WERE NECESSARILY INVOLVED.
It will be assumed that the tribes who constructed the earth-works of the Ohio Valley were American Indians. No other supposition is tenable. The implements and utensils found in the mounds indicate very plainly that they had attained to the Middle Status of barbarism. They do not fully answer the tests of this condition, since they neither cultivated by irrigation, so far as is known, nor constructed houses of adobe bricks or of stone; but, in addition to the earth-works to be considered, they mined native copper and wrought it into implements and utensils—acts performed by none of the tribes in the Lower Status of barbarism; and they depended chiefly upon horticulture for subsistence. They had also carried the art of pottery to the ornamental stage, and manufactured textile fabrics of cotton or flax, remains of which have been found wrapped around copper chisels. These facts, with others that will appear, justify their recognition as in the same status with the Village Indians of New and Old Mexico and Central America. They occupied areas free from lakes as a rule, and, therefore, the poorest for a fish subsistence. This shows of itself that their chief reliance was upon horticulture. The principal places where their villages were situated were unoccupied areas at the epoch of European discovery, because unadapted to tribes in the Loner Status of barbarism, who depended upon fish and game as well as upon maize and plants.
A knowledge of the general character of the houses of the American aborigines will enable us to infer what must have been the general character of those of the Mound-Builders. This, again, was influenced by the condition of the family. Among the Indian tribes, in whatever stage of advancement, the family was found in the pairing form, with separation at the option of either party. It was founded upon marriage between single pairs, but it fell below the monogamian family of civilized society. In their condition it was too weak an organization to face alone the struggle of life, and it sought shelter in large households, formed on the basis of kin, with communism in living as an incident of their plan of life. While exceptional cases of single families living by themselves existed among all the tribes, it did not break the general rule of large households, and the practice in them of communism in living. These usages entered into and determined the character of their house architecture. In all parts of North and South America, at the period of European discovery, were found communal of joint-tenement houses, from those large enough to accommodate five, ten, and twenty families, to those large enough for fifty, a hundred, and in some cases two hundred or more, families. These houses differed among themselves in their plan and structure as well as size; but a common principle ran through them which was revealed by their adaptation to communistic uses. They reflect their condition and their plan of life with such singular distinctness as to afford practical hints concerning the houses of the Mound-Builders.
THE PROBABLE CENTER FROM WHICH THE MOUND-BUILDERS EMIGRATED INTO THESE AREAS.
It is well known that the highest type of Village Indian life was found in Yucatan, Chiapas, and Guatemala, and that the standard declines with the advance of the type northward into Mexico and New Mexico, thus tending to show that it was best adapted to a warm climate; but it does not follow that we must look to these distant regions for the original home of the Mound-Builders. The nearest point from which they could have been derived was New Mexico, and that is rendered the probable point from physical considerations, and still more from their greater nearness in condition to the Village Indians of New Mexico, below whom they must be ranked. The migrations of the American Indian tribes were gradual movements under the operation of physical causes, occupying long periods of time and with slow progress. There is no reason for supposing, in any number of cases, that they were deliberate migrations with a definite destination. With maize, beans, and squashes (the staples of an established horticulture), the Village Indians were independent of fish and game as primary means of subsistence, and with the former they possessed superior resources for migrating over the wide expanses of open prairies between New Mexico and the Mississippi. The movement of the tribes who constructed the earth-works in question can be explained as a natural spread of Village Indians from the valley of the Rio Grande, on the San Juan, to the shores of the Gulf of Mexico, and thence northward to the valley of the Ohio, which was both easy and feasible. Its successful extension for any considerable distance north of the gulf was rendered improbable, by reason of the increasing severity of the climate. There are some reasons for supposing that climate delayed the movement for centuries, and finally defeated the attempt to transplant permanently even the New Mexican type of village life into a northern temperature so much lower during the greater part of the year.
A number of archeologists, who have considered the question of the probable anterior home of the Mound-Builders, are inclined to derive them from Central America. The ground for this opinion seems to be the fact that horticulture must have originated in a semi-tropical region, where this type of village life was first developed, and, therefore, that all the forms of this life were derived from thence. It would be a mistake, as it seems to the writer, to adopt the track of horticulture as that of Indian migration. In its first spread horticulture would be more apt to return upon the line of the latter than wait to be carried, by actual migrations, with the people. Moreover it is unnecessary to invoke such an argument, for the reason that New Mexico had been for ages the seat of horticultural and Village Indians, and was necessarily occupied by them long before the country east of the Mississippi. Every presumption is in favor of their derivation from New Mexico as their immediate anterior home, where they were accustomed to snow and to a moderate degree of cold.
[Footnote: At a recent meeting of the National Academy of Science at Washington, where this subject was presented, Prof. O. C. Marsh remarked, in confirmation of this suggestion, that "in a series of comparisons of Indian skulls, he had been struck with the similarity between those of the Pueblo Indians of New Mexico and of the Mound-Builders. As the shape of the Mound-Builder's skull is very peculiar, the coincidence is a very striking one.">[