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plains. Glacial period, with an inter-glacial mild period in the middle and great submergence of the continents toward the close.

      Anthropic.—Palanthropic, or post-glacial, in which the land emerges and attains a very wide extension, and is inhabited by a varied mammalian fauna. Man appears in Europe, Asia, and North Africa. Terminated by a recurrence of cold and great subsidence, deluging all the lower lands. Neanthropic.—Area of continents smaller than in the previous period. Surviving races of men and species of animals repeople the world. Modern races of men and modern animals.

      

      CHAPTER IV

      We have now to inquire more particularly what we can learn as to the earliest men known to us, those who appeared in Western Asia and Europe at the close of the glacial period, when the cold had passed away and a genial climate had succeeded, and when the continents of the northern hemisphere had attained to their largest dimensions, were clothed with a rich vegetation and tenanted by an abundant mammalian fauna, including many large and important creatures now extinct.

      FLINT HACHE OF THE ANCIENT OR CHELLEAN TYPE, AURILLAC (after Carthaillac)

      

      Notwithstanding these limitations, however, it is wonderful that so much has been recovered from the ground by the diligence of collectors, and that the material thus obtained has proved so fertile in information respecting our long-perished ancestors.

      

      Supposing, then, that we search for remains of palæocosmic men in river alluvia, or in caves of residence or burial, or in similar repositories, the question next arises, by what means can we distinguish their bones from those of later times? The following criteria are available:

      (1) The remains were in their present condition at least as long ago as the date of the earliest history or tradition. This evidence is of course of greatest value in those regions in which history extends farthest back. Thus the remains of early men in the Lebanon caves, which we know date much farther back than the arrival of the first Phœnicians and Canaanites in Syria, are in a different position, in so far as history is concerned, from those occurring in countries whose written history goes back only a few centuries.

      (2) The deposits containing these remains may underlie those holding relics of historic times, or may indicate different physical conditions of the districts in which they occur from those known within historic periods. This is the case with some river beds, as those of Grenelle, near Paris, and with the successive deposits in old caves of residence.

      (3) They may be accompanied by remains of animals now extinct in the regions in question, and whose disappearance and replacement by the modern fauna implies great lapse of time and physical changes; as, for instance, when we find that men have left remains of their feasts holding bones of the extinct woolly rhinoceros and his contemporaries, or in now temperate climates, those of the reindeer.

      (4) The remains themselves may indicate a race or races of men and a condition of the arts of life different from any known in the region in historic times. Thus we may have skulls and skeletons indicating men racially distinct from any now extant, and implements and weapons different from those in use in the times of history or tradition.

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