The four ages, therefore, do not mark periods in the
life of humanity, but only epochs in the civilization of each country.
=Uncertainties.=--Prehistoric archaeology is yet a very young science.
We have learned something of primitive men through certain remains
preserved and discovered by chance. A recent accident, a trench, a
landslip, a drought may effect a new discovery any day. Who knows what
is still under ground? The finds are already innumerable. But these
rarely tell us what we wish to know. How long was each of the four
ages? When did each begin and end in the various parts of the world?
Who planned the caverns, the lake villages, the mounds, the dolmens?
When a country passes from polished stone to bronze, is it the same
people changing implements, or is it a new people come on the scene?
When one thinks one has found the solution, a new discovery often
confounds the archaeologists. It was thought that the Celts originated
the dolmens, but these have been found in sections which could never
have been traversed by Celts.
=What has been determined.=--Three conclusions, however, seem certain:
1.
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