Here, too, were accumulated proofs of the upward tendency of the
human race. Implements of polished stone, bone, leather, pottery
of various grades, woven cloth, bones of several kinds of
domestic animals, various sorts of grain, bread which had been
preserved by charring, and a multitude of evidences of progress
never found among the earlier, ruder relics of civilization,
showed yet more strongly that man had arrived here at a still
higher stage than his predecessor of the drift, cave, and
shell-heap periods, and had gone on from better to better.
Very striking evidences of this upward tendency were found in
each class of implements. As by comparing the chipped flint
implements of the lower and earlier strata in the cave period
with those of the later and upper strata we saw progress, so, in
each of the periods of polished stone, bronze, and iron, we see,
by similar comparisons, a steady progress from rude to perfected
implements; and especially is this true in the remains of the
various lake-dwellings, for among these can be traced out
constant increase in the variety of animals domesticated, and
gradual improvements in means of subsistence and in ways of living.
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