All estimates of the Time involved in these evolutions of early man are notoriously most divergent and most difficult to be sure of; but if we take 500,000 years ago for the first appearance of veritable Man (homo primigenius), (2) and (following Professor W. J. Sollas) (3) 30,000 or 40,000 years ago for the first tool-using men (homo sapiens) of the Chellean Age (palaeolithic), 15,000 for the rock-paintings and inscriptions of the Aurignacian and Magdalenian peoples, and 5,000 years ago for the first actual historical records that have come down to us, we may perhaps get something like a proportion between the different periods. That is to say, half a million years for the purely animal man in his different forms and grades of evolution. Then somewhere towards the end of palaeolithic or commencement of neolithic times Self-consciousness dimly beginning and, after some 10,000 years of slow germination and pre-historic culture, culminating in the actual historic period and the dawn of civilization 40 or 50 centuries ago, and to-day (we hope), reaching the climax which precedes or foretells its abatement and transformation. (2) Though Dr. Arthur Keith, Ancient Types of Man (1911), pp. 93 and 102, puts the figure at more like a million. (3) See Ancient Hunters (1915); also Hastings's Encycl. art. "Ethnology"; and Havelock Ellis, "The Origin of War," in The Philosophy of Conflict and other Essays. No doubt many geologists and anthropologists would favor periods greatly LONGER than those here mentioned; but possibly there would be some agreement as to the RATIO to each other of the times concerned: that is, the said authorities would probably allow for a VERY long animal-man (1)-period corresponding to the first stage; for a much shorter aggressively 'self conscious' period, corresponding to the Second Stage--perhaps lasting only one thirtieth or fiftieth of the time of the first period; and then--if they looked forward at all to a third stage--would be inclined for obvious reasons to attribute to that again a very extended duration. (1) I use the phrase 'animal-man' here, not with any flavor of contempt or reprobation, as the dear Victorians would have used it, but with a sense of genuine respect and admiration such as one feels towards the animals themselves.