"The peculiar form of the Cliff Dweller's skull is produced by some custom of the tribe in binding the infant upon a board or other substance. This is proved by the fact that the flatness of the back head is uniformly at the same angle, and that the upper tables of the skull give evidence of abnormal pressure. There is also in this collection one skull which is an exception, and shows exactly the development we would expect to find in a normal form when such pressure was not applied. The skull is that of a young female, and in outline it is strikingly like that of the ordinary Caucasian skull. In fact, I would pronounce it a Caucasian skull were it not for the structure of the superior maxillary bone, which shows a radical departure from the type of either of the five present races. The Cliff Dwellers are more like the Caucasian than the Indian, and more like the Hindoo than either. That they possessed a higher order of intellect than any Indian tribe of which we have knowledge does not admit of doubt. "The most striking peculiarity of these skulls is their delicate and yet strong quality. The grain or texture of the bone is much more delicate and fine than the average of Caucasian skulls that belong to the uneducated classes. The illumination of the skull discloses some interesting facts. It is well known to phrenologists that the skull is thinner in those regions that are most constantly used in the mental habits of the individual. The illumination of the skulls of these two youths (here Professor Windsor inserted a lighted taper in each) discloses a nearly uniform thinness of the entire skull, showing that they exercised all the faculties of the mind. The skull of this old warrior, however, presents a different appearance under the same test. You will notice that the illumination is confined to that portion of the skull lying around the base of the brain, and running highest in the forehead. The conclusion to be drawn from this is that the individual who once wore this skull was a man of very practical intellect. The perceptive organs, the knowing and reasoning faculties, executive ability and the social organs of amativeness and friendship, particularly the latter, are all bright and particularly well developed.