The parts about the Lake Titicaca form the present country of the Aymaras, whose heads are much like those of the other Americans, whose taste for architecture is but slight, and whose knowledge of having descended from a people more architectural than themselves is none.

Nevertheless, there are vast ruins in their district; whilst the heads of those whose remains are therein preserved have skulls with the sutures obliterated, and with remarkable frontal, lateral, and occipital depressions.

Does this denote an extinct species? Individually, I think it does not; because, individually, with many others, I know that certain habits decline, and I also believe that the flattenings of the head are artificial. Nevertheless, if I, ever so little, exaggerated the permanency of habits, or if I identified a habit with an instinct, or if I considered the skulls natural, the chances are that I should recognise the remains of ancient stock—possibly an ancient species—without congeners and without descendants.

The antiquity of the human species.—Our views on this point depend upon our views as to its unity or non-unity; so much so, that unless we assume either one or the other, the question of antiquity is impracticable. And it must also be added that, unless the inquiry is to be excessively complicated, the unity-doctrine must take the form of descent from a single pair.

Assuming this, we take the most extreme specimens of difference, whether it be in the way of physical conformation or mental phænomena—of these last, language being the most convenient. After this, we ask the time necessary for bringing about the changes effected; the answer to this resting upon the induction supplied within the historical period; an answer requiring the application of what has already been called Ethnological Dynamics.

On the other hand, we may assume a certain amount of original difference, and investigate the time requisite for effecting the existing amount of similarity.

The first of these methods requires a long, the second a short period; indeed, descent from a single pair implies a geological rather than a historical date.

Furthermore—that uniformity in the average rate of change which the geologist requires, ethnology requires also.

The geographical origin of Man.—Supposing all the varieties of Man to have originated from a single protoplast pair, in what part of the world was that single protoplast pair placed? Or, supposing such protoplast pairs to have been numerous, what were the respective original locations of each? I ask these questions without either giving any answer to them, or exhibiting any method for discovering one. Of the three great problems it is the one which has received the least consideration, and the one concerning which there is the smallest amount of decided opinion. The conventional, provisional, or hypothetical cradle of the human species is, of course, the most central point of the inhabited world; inasmuch as this gives us the greatest amount of distribution with the least amount of migration; but, of course, such a centre is wholly unhistorical.

Race—What is the meaning of this word?