In the new atmosphere the soil is
changed, new chemical elements enter in, seeds are brought to it by the
four winds--and it is changed. But it is still the sea-floor
transformed.
Just so the baby brain, complete in parts and mechanism at birth, is a
different brain with every day of growth in its new environment, with
every contact with the external world. But it is, primarily and in its
elements, the brain evolved through thousands of centuries of pushing up
to man's level through the sea of animal life, and hundreds of centuries
more of the development of man's brain to its present complete mechanism
through experience with constantly changing environment.
Hence, when the baby sees light and responds by tightly shutting his
eyes, then later by opening them to investigate, his sensation is what
it is because through the aeons of the past man has established a
certain relation to light through experiencing it. To go further than
this, and to find the very beginning, how the first created life came to
respond to environment at all, is to go beyond the realm of the actually
known.
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