But, fortunately, we are no more compelled to fetter our belief within such limits as regards man than to suppose that his appearance on the globe was coeval with or immediately successive to its own creation at that late date. For while geological science, on the one hand, carries back the creation of the world and the appearance of life upon its surface to a period so remote that it is impossible to estimate it, and difficult even to faintly approximate to it, so, upon the other, the researches of palæontologists have successively traced back the existence of man to periods variously estimated at from thirty thousand to one million years--to periods when he co-existed with animals which have long since become extinct, and which even excelled in magnitude and ferocity most of those which in savage countries dispute his empire at the present day. Is it not reasonable to suppose that his combats with these would form the most important topic of conversation, of tradition, and of primitive song, and that graphic accounts of such struggles, and of the terrible nature of the foes encountered, would be handed down from father to son, with a fidelity of description and an accuracy of memory unsuspected by us, who, being acquainted with reading and writing, are led to depend upon their artificial assistance, and thus in a measure fail to cultivate a faculty which, in common with those of keenness of vision and hearing, are essential to the existence of man in a savage or semi-savage condition?[30] The illiterate backwoodsman or trapper (and hence by inference the savage or semi-civilized man), whose mind is occupied merely by his surroundings, and whose range of thought, in place of being diffused over an illimitable horizon, is confined within very moderate limits, develops remarkable powers of observation and an accuracy of memory in regard to localities, and the details of his daily life, surprising to the scholar who has mentally to travel over so much more ground, and, receiving daily so many and so far more complex ideas, can naturally grasp each less firmly, and is apt to lose them entirely in the haze of a period of time which would still leave those of the uneducated man distinguishable or even prominent landmarks.[31] Variations in traditions must, of course, occur in time, and the same histories, radiating in all directions from centres, vary from the original ones by increments dependent on proportionately altered phases of temperament and character, induced by change of climate, associations and conditions of life; so that the early written history of every country reproduces under its own garb, and with a claim to originality, attenuated, enriched, or deformed versions of traditions common in their origin to many or all.[32]