Doctor Morton says that these mummies from Peru have the same peculiarities in the form of the skull, the same delicacy of the bones, and the same remarkable smallness of the hands and feet, with that found in the sepulchre at San Francisco. He says, too, from an examination of nearly four hundred skulls of individuals belonging to older nations of Mexico and Peru, and of skulls dug from the mounds of our western country, that he finds them all formed on the same model, and conforming in a remarkable manner to that brought from San Francisco; and that this cranium has the same _type_ of physical conformation which has been bestowed with amazing uniformity upon all the tribes on our continent, from Canada to Patagonia, and from the Atlantic to the Pacific Ocean. He adds, that it affords additional support to the opinion which he has always entertained, that, notwithstanding some slight variation in physical conformation, and others of a much more remarkable character in intellectual attainments, all the aboriginal Americans of all known epochs belong to the same great and distinctive race. If this opinion is correct, and I believe it--if this skeleton does present the same _type_ of physical conformation with all the tribes of our continent--then, indeed, do these crumbling bones declare, as with a voice from the grave, that we cannot go back to any ancient nation of the Old World for the builders of these cities; they are not the works of people who have passed away, and whose history is lost, but of the same great _race_ which, changed, miserable, and degraded, still clings around their ruins. To return to the ruins of San Francisco. We devoted two days more to excavating, but did not make any farther discoveries. Among the ruins were circular holes in the ground like those at Uxmal. The mouth of one was broken and enlarged, and I descended by a ladder into a dome-shaped chamber, precisely the same as at Uxmal, but a little larger. At Uxmal the character of these was mere matter of conjecture; but at this short distance, the Indians had specific notions in regard to their objects and uses, and called them chultones, or wells. In all directions, too, were seen the oblong stones hollowed out like troughs, which at Uxmal were called pilas, or fountains, but here the Indians called them holcas or piedras de molir, stones for grinding, which they said were used by the ancients to mash corn upon; and the proprietor showed us a round stone like a bread roller, which they called kabtum, brazo de piedra, or arm of stone, used, as they said for mashing the corn. The different names they assigned in different places to the same thing, and the different uses ascribed to it, show, with many other facts, the utter absence of all traditionary knowledge among the Indians; and this is perhaps the greatest difficulty we have to encounter in ascribing to their ancestors the building of these cities.