Now what is the bearing of these somewhat scanty data on the question of progress? It is not easy to extract from them more than the general impression that, as time went on, the breed made persistent headway as regards both the complexity of its organization and the profusion of its forms. After all, we must not expect too much from this department of the subject. For one thing, beyond the limits of North-western Europe the record is almost blank; and yet we can scarcely hope to discover the central breeding-place of man in what is, geographically, little more than a blind alley. In the next place, Physical Anthropology, not only in respect to human palaeontology, but in general, is as barren of explanations as it is fertile in detailed observations. The systematic study of heredity as it bears on the history of the human organism has hardly begun. Hence, it would not befit one who is no expert in relation to such matters to anticipate the verdict of a science that needs only public encouragement in order to come into its own. Suffice it to suggest here that nature as she presides over organic evolution, that is, the unfolding of the germinal powers, may be conceived as a kindly but slow-going and cautious liberator. One by one new powers, hitherto latent, are set free as an appropriate field of exercise is afforded them by the environment. At first divergency is rarely tolerated. A given type is extremely uniform. On the other hand, when divergency is permitted, it counts for a great deal. The wider variations occur nearest the beginning, each for a long time breeding true to itself. Later on, such uncompromising plurality gives way to a more diffused multiplicity begotten of intermixture. Mongrelization has set in. Not but what there may spring up many true-breeding varieties among the mongrels; and these, given suitable conditions, will be allowed to constitute lesser types possessed of fairly uniform characters. Such at least is in barest outline the picture presented by the known facts concerning the physical evolution of man, if one observe it from outside without attempting to explore the hidden causes of the process. Some day, when these causes are better understood, man may take a hand in the game, and become, in regard to the infinite possibilities still sleeping in the transmitted germ, a self-liberator. Nature is but a figurative expression for the chances of life, and the wise man faces no more chances than he needs must. Scientific breeding is no mere application of the multiplication table to a system of items. We must make resolutely for the types that seem healthy and capable, suppressing the defectives in a no less thorough, if decidedly more considerate, way than nature has been left to do in the past. Here, then, along physical lines is one possible path of human progress, none the less real because hitherto pursued, not by the aid of eyes that can look and choose, but