The forces and elements of environment make and work
against those at each stage who wander from the right path, and for
those who follow it. And thus natural selection arises as the total
result of the combined working of all these forces. They all unite
in one resultant working along a certain line, and natural selection
is the effect of this resultant. In the stage represented by hydra
the forces of environment combine in a resultant which works for
digestion and reproduction and the best development of their organs.
But as the animal changes he comes into a new relation or occupies a
new position in respect to these forces. New elements in the old
environment are beginning to press upon him. And the resultant
changes accordingly. He may be compared to a steamer at sea which
raises a sail. The wind has been blowing for hours, but the sail
gives it a new hold on the ship. Steam and wind now combine in a new
resultant of forces. From worms upward environment manifests itself
through natural selection as a power working for muscular force and
brute strength or activity.
But soon natural selection ceases to select on the ground of brute
force. After a time environment proves to be a power making for
shrewdness. And when the mammal has appeared the resultant of the
forces of environment impels more and more toward unselfishness, and
when man has appeared environment proves to be a "power, not
ourselves, that makes for righteousness.
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