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 —We do not know when man first appeared upon the earth. We only know that in ages long past, when both the climate and the outline of the continents were very different from what they are at present, primitive man roamed over them with animals now extinct; and that, about 5000, when the historic curtain first rises, in some favored regions, as in the valleys of the Nile and the Euphrates, there were nations and civiUzations already venerable with age, and possessing arts, governments, and institutions that bear evidence of slow growth through very long periods of time.

—The uncounted millenniums which lie back of the time when man began to keep written records of what he thought and did and of what befell him, are called the Prehistoric Age.

The comparatively few centuries of human life which are made known to us through written records comprise the Historic Age. In the valleys of the Nile and the Euphrates there have been discovered written records which were made at least four or five thousand years before Christ; so we say that the historic period began in those lands six or seven thousand years ago. On the island of Crete numerous inscriptions have recently been found that apparently were written as early as the fourth millennium These, however, have not yet been deciphered. Some written records used by Chinese historians seem to go back to the third