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Sociology and Modern Social Problems by Charles A. (Charles Abram) Ellwood
page 27 of 298 (09%)
he wrote is that of the Dutch botanist, Hugo de Vries, who has shown
that the variations which are fruitful for the production of new species
are probably great or discontinuous variations, which he terms
"mutations," instead of the small fluctuating variations which Darwin
thought were probably most important in the production of new species.
De Vries' theory in no way affects the doctrine of descent, nor does it
take away from the importance of natural selection in fixing the
variations. Darwin's theory, therefore, stands in all of its essentials
to-day unquestioned by men of science, and it must be assumed by the
student of sociology in any attempt to explain social evolution.

Spencer's Theory of Universal Evolution.--A second meaning given to the
word _evolution_ is that which Spencer popularized in his _First
Principles_. This is a philosophical theory of the universe which
asserts that not only have species of animals come to be what they are
through a process of development, but everything whatsoever that exists,
from molecules of matter to stars and planets. It is the view that the
universe is in a process of development. Evolution in this wider sense
includes all existing things whatsoever, while evolution in the sense of
Darwin's theory is confined to the organic world. While the theory that
all things existing have through a process of orderly change come to be
what they are, is a very old one, yet it was undoubtedly Spencer's
writings which popularized the theory, and to Spencer we also owe the
attempt in his Synthetic Philosophy to trace the working of evolution in
all the different realms of phenomena. The belief in universal evolution
which Spencer popularized has also come to be generally accepted by
scientific and philosophical thinkers. While Spencer's particular
theories of evolution may not be accepted, some form of universal
evolution is very generally believed in. The thought of evolution now
dominates all the sciences,--physical, biological, psychological, and
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