The use of pearls as ornaments, and their deposit with the remains of chiefs and persons of distinction, have already been described as familiar among the Indian tribes of tidewater Virginia, in the notes above cited from early explorers and colonists. It is a curious circumstance, however, that this habit does not appear to have extended in that part of the country much beyond the dominions of Powhatan, as no pearls have been noted in the Indian graves in Maryland. This statement, in reply to a letter of special inquiry, is made by Dr. P. R. Uhler, of the Peabody Institute of Baltimore, who has been making very careful studies of all aboriginal remains in that region, for the Maryland Academy of Sciences.

It would seem from this and other evidence, that the use and appreciation of pearls must have been in some way a tribal matter, familiar to some and not to others, of the Indian peoples. In the Mississippi Valley, the ancient population known as the mound-builders, by some regarded as a distinct and earlier race, and by others as of true Indian stock, although much more advanced in arts and culture, have left in their mounds most remarkable quantities of pearls. But here again, the same feature appears, that these treasures are not found wherever there are mounds, but only in certain regions. Of these, by far the most celebrated is that of the Scioto and Miami valleys, in Ohio. Outside of these, no large amounts have been found, and only at a few localities are they met with at all.

The valleys of the Miami and Scioto rivers and their tributaries contain many remarkable mounds and “earthworks,” which have attracted much attention, and have been more or less explored at different times, with increasing care and thoroughness as archæological science has advanced. It may be well to give a brief, general account of these investigations and some leading features of the mounds as a whole, before going into particulars as to the occurrence of pearls.

The first important and scientific study of these remarkable structures was that conducted in the early forties by Dr. Edwin H. Davis and Mr. E. George Squier, and published in their celebrated and standard work entitled “Ancient Monuments of the Mississippi Valley,” issued by the Smithsonian Institution in 1848. This book and the “Correspondence” in regard to the mounds by the same writers, published in 1847, were the first works issued by the Smithsonian Institution.

According to Squier and Davis,[[540]] two quarts of pearls were originally deposited in one of these mounds. The writers consider that the pearls were probably derived from the fisheries in the southern waters, and they regard their presence in the Ohio mounds as a proof of “an extensive communication with southern and tropical regions and a migration from that direction.”

A number of pearls or pearl beads from the Ohio mounds and which formerly belonged to the Squier and Davis collection, are now in the Blackmore Museum at Salisbury, England. According to a communication from Dr. H. P. Blackmore, director of the museum, these pearls, which originally formed five necklaces, have been much injured by the action of fire at the time the bodies of those interred in the mounds were burned. Mr. Blackmore considers that the greater part of the pearl beads are of mother-of-pearl cut from some large shell, made into a round shape and perforated, but, after very careful examination, he is of the opinion that about ten may be classed as natural pearls. Their present color is a dull, leaden gray, rather lighter than the “black pearl” of commerce. The size of these pearls or beads varies from four millimeters to twenty millimeters in diameter. One of the necklaces consists of thirty-three beads well graduated, but of a dead white color from the action of the earth.

A quarter of a century later, when the Centennial Exposition was in preparation, the Smithsonian Institution undertook the formation of a public exhibit illustrating American archæology, and engaged Prof. F. W. Putnam, of Cambridge, Massachusetts, to open and examine some of the most remarkable of the mounds described by Squier and Davis. These explorations were continued for some years, partly for the government and partly for the Peabody Museum of Archæology at Cambridge, and their results were exhibited at the Columbian Exposition in 1893. The mounds explored were chiefly in the valley of the Little Miami, and particularly those known as the Turner group.

A very important series of explorations was also carried on by Mr. Warren K. Moorehead, covering the years from 1887 to 1893, largely in preparation for the Columbian Exposition. These investigations were mainly in the Scioto valley, in the counties of Ross, Franklin, and Pickaway, Ohio. Among the most important results then obtained were those from the mounds of the “Porter” and “Hopewell” groups, in Ross County.

Since that time, much valuable work has been done by Mr. Moorehead and others, and particularly under the auspices of the Ohio State Archæological and Historical Society. The latest and most complete investigation was made for this society in 1903, by its curator, Prof. William C. Mills, in the Harness mound, seven miles north of Chillicothe, Ohio, near the Scioto River, in Ross County. This locality had been previously explored in part, by Professor Putnam in 1885, and Mr. Moorehead in 1896; it was now systematically examined down to the original surface at every point.

Squier and Davis divided these ancient monuments into four classes: (1) Altar mounds, which contain what appear to be altars, and are also called hearths, of stone or hardened clay; (2) Burial mounds, containing human bones; (3) Temple mounds, with neither altars nor bones, but seeming to have had some special religious significance; and (4) Anomalous mounds, including “mounds of observation” and others of mixed or uncertain character. The burials are found to be of two kinds, simple interment and cremation; and these are sometimes met with in the same mound.