Suppose that some enduring intelligence watched through the ages the successions of life upon this planet, marked the spreading first of this species and then that, the conflicts, the adaptations, the predominances, the dyings away, and conceive how it would have witnessed this strange dramatic emergence of a rare great ape to manhood. To such a mind the creature would have seemed at first no more than one of several varieties of clambering frugivorous mammals, a little distinguished by a disposition to help his clumsy walking with a stake and reinforce his fist with a stone. The foreground of the picture would have been filled by the rhinoceros and mammoth, the great herds of ruminants, the sabre-toothed lion and the big bears. Then presently the observer would have noted a peculiar increasing handiness about the obscurer type, an unwonted intelligence growing behind its eyes. He would have perceived a disposition in this creature no beast had shown before, a disposition to make itself independent of the conditions of climate and the chances of the seasons. Did shelter fail among the trees and rocks, this curious new thing began to make itself harbours of its own; was food irregular, it multiplied food. It began to spread out from its original circumstances, fitting itself to novel needs, leaving the forests, invading the plains, following the watercourses upward and downward, presently carrying the smoke of its fires like a banner of conquest into wintry desolations and the high places of the earth. The first onset of man must have been comparatively slow, the first advances needed long ages. By small degrees it gathered pace. The stride from the scattered savagery of the earlier stone period to the first cities, historically a vast interval, would have seemed to that still watcher, measuring by the standards of astronomy and the rise and decline of races and genera and orders, a step almost abrupt. It took, perhaps, a thousand generations or so to make it. In that interval man passed from an animallike obedience to the climate and the weather and his own instincts, from living in small family parties of a score or so over restricted areas of indulgent country, to permanent settlements, to the life of tribal and national communities and the beginnings of cities. He had spread in that fragment of time over great areas of the earth’s surface, and now he was adapting himself to the Arctic circle on the one hand and to the life of the tropics on the other; he had invented the plough and the ship, and subjugated most of the domestic animals; he was beginning to think of the origin of the world and the mysteries of being. Writing had added its enduring records to oral tradition, and he was already making roads. Another five or six hundred generations at most bring him to ourselves. We sweep into the field of that looker-on, the momentary incarnations of this sempiternal being, Man. And after us there comes— A curtain falls.