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—
The time in which we, whose minds meet here in this writing, were born and live and die, would be to that imagined observer a mere instant’s phase in the swarming liberation of our kind from ancient imperatives. It would seem to him a phase of unprecedented swift change and expansion and achievement. In this last handful of years, electricity has ceased to be a curious toy, and now carries half mankind upon their daily journeys, it lights our cities till they outshine the moon and stars, and reduces to our service a score of hitherto unsuspected metals; we clamber to the pole of our globe, scale every mountain, soar into the air, learn how to overcome the malaria that barred our white races from the tropics, and how to draw the sting from a hundred such agents of death. Our old cities are being rebuilt in towering marble; great new cities rise to vie with them. Never, it would seem, has man been so various and busy and persistent, and there is no intimation of any check to the expansion of his energies.