[312]
While, then, it is not denied that many instances of
retrogression can be found, the consenting voice of unbiased
investigators in all lands has declared more and more that the
beginnings of our race must have been low and brutal, and that
the tendency has been upward. To combat this conclusion by
examples of decline and deterioration here and there has become
impossible: as well try to prove that, because in the
Mississippi there are eddies in which the currents flow
northward, there is no main stream flowing southward; or that,
because trees decay and fall, there is no law of upward growth
from germ to trunk, branches, foliage, and fruit.
A very striking evidence that the theological theory had become
untenable was seen when its main supporter in the scientific
field, Von Martius, in the full ripeness of his powers, publicly
declared his conversion to the scientific view.
Yet, while the tendency of enlightened human thought in recent
times is unmistakable, the struggle against the older view is
not yet ended.
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