modern history.

Paleontology assures us, in addition, that the ancient philosophers
who, with less reason, held the same doctrine, erred in supposing that
the phases formed a cycle, exactly repeating the past, exactly
foreshadowing the future, in their rotations. On the contrary, it
furnishes us with conclusive reasons for thinking that, if every link
in the ancestry of these humble indigenous plants had been preserved
and were accessible to us, the whole would present a converging series
of forms of gradually diminishing complexity, until, at some period in
the history of the earth, far more remote than any of which organic
remains have yet been discovered, they would merge in those low groups
among which the Boundaries between animal and vegetable life become
effaced.*

* "On the Border Territory between the Animal and the Vegetable
Kingdoms," Essays, vol. viii. p. 162

[6] The word "evolution," now generally applied to the cosmic process,
has had a singular history, and is used in various senses.* Taken in
its popular signification it means progressive development, that is,
gradual change from a condition of relative uniformity to one of
relative complexity; but its connotation has been widened to include
the phenomena of retrogressive metamorphosis, that is, of progress
from a condition of relative complexity to one of relative uniformity.

As a natural process, of the same character as the development of a
tree from its seed, or of a fowl from its egg, evolution excludes
creation and all other kinds of supernatural intervention. As the
expression of a fixed order, every stage of which is the effect of