The mound skulls are readily distinguishable from those of the Red Indian. Only in the Davenport crania and the five dolichocephali from Tennessee do we see any approximation as to form. However, the remaining characteristics of the Davenport crania establish the fact that they belonged to people of the mounds. In our classification of Dr. Morton’s measurements, it will be observed that only two _supposed_ mound skulls appear among the dolichocephali (long skulls, A), and too much doubt is attached to their genuineness to admit of their use in drawing inferences. All the remainder belong to the savage tribes except three Peruvians of the ancient race of the region of Titicaca. In the table of brachycephali but few of the savage tribes are represented, except those which practice artificial compression to the extent of deformity. The mound skull as compared with the Inca Peruvian presents few resemblances, except that both generally belong to the brachycephalic class, and the singular and important fact already mentioned that the Inca bone has been found in North American mound crania. It is possible that when more extensive research is made, this distinguishing feature may lead to the conclusion that the races were one or closely related. On the other hand, the massive bony structure of some of the mound crania does not correspond with the facial bones of the Inca crania, which are very light and delicate. Prof. Wilson has pointed out the additional fact that the vertical diameter of the Peruvian short crania is not so great as that of the mound and Mexican short skulls, but a reference to the Professor’s own tables shows that the mean difference amounts only to thirty-seven-hundredths of an inch, altogether too small a variation to serve as the basis for ethnic generalizations.[246] Few if any similarities can be traced between the dolichocephali of Peru and the brachycephalic Mound-builders, the only resemblances being the heavy bony structure possessed in common by both races. The crania of the dolichocephali of Peru are pronounced of a Mongol cast and form, and are in every respect unlike the mound crania. Turning our attention, however, to the ancient Mexican crania, we find, so far as we are able to judge from the limited number of skulls which have come into the possession of ethnologists, a parallelism in measurements and resemblance in the various distinctive features, such as flattened occiput, broad transverse diameter, retreating forehead, strong bony structure, and a remarkable agreement in vertical diameter with those of the mounds of the Mississippi Basin, which point unmistakably to the closest relationship. Seven Mexican brachycephali measured by Prof. Wilson in the Boston and Philadelphia collections previously referred to, gave a mean vertical diameter of 5.55 inches.[247] Four Mound-builder crania measured by the same investigation gave precisely the same result, while the remaining