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for life, any 1859 1860 1861 1866
OMIT 1869 1872

its physical conditions of life, 1861 1866
external nature, 1859 1860
their physical conditions of life, 1869 1872

1 blocks not present in 1859 1860 1861 1866; present in 1869 1872
But the expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.

the woodpecker and
missletoe;
the misletoe;
the mistletoe;
and only a little less plainly in the humblest parasite which clings to the hairs of a quadruped or feathers of a
bird:
bird;
in the structure of the beetle which dives through the
water:
water;
in the plumed seed which is wafted by the gentlest breeze; in short, we see beautiful adaptations everywhere and in every part of the organic world.
Again, it may be asked, how is it that varieties, which I have called incipient species, become ultimately converted into good and distinct species, which in most cases obviously differ from each other far more than do the varieties of the same species? How do those groups of species, which constitute what are called distinct genera, and which differ from each other more than do the species of the same genus, arise? All these results, as we shall more fully see in the next chapter, follow
inevitably
....
from the struggle for life. Owing to this
struggle,
struggle
for life, any
variations,
variation,
however
slight
slight,
and from whatever cause proceeding, if
they
it
be in any degree profitable to
the
an
individuals
individual
of
a
any
species, in
their
its
infinitely complex relations to other organic beings and to its physical conditions of life, will tend to the preservation of
such
that
individuals,
individual,
and will generally be inherited by
the
its
offspring. The offspring, also, will thus have a better chance of surviving, for, of the many individuals of any species which are periodically born, but a small number can survive. I have called this principle, by which each slight variation, if useful, is preserved, by the term
of
....
Natural Selection, in order to mark its relation to
mans
man's
power of selection. We have seen that man by selection can certainly produce great results, and can adapt organic beings to his own uses, through the accumulation of slight but
use- ful
useful
variations, given to him by the hand of Nature. But Natural Selection, as we shall hereafter see, is a power incessantly ready for action,