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1 blocks not present in 1859 1860 1861 1866 1869; present in 1872
Unintentionally he exposes organic beings to new and changing conditions of life, and variability ensues; but similar changes of conditions might and do occur under nature.

variations 1859 1860 1861
variations, 1866 1869
individual differences and variations, 1872

injurious variations, I call 1859 1860 1861 1866 1869
those which are injurious, I have called 1872

Selection. 1859 1860 1861 1866
Selection, or the Survival of the Fittest. 1869 1872

the species called polymorphic. 1859 1860 1861 1866
certain polymorphic species, or would ultimately become fixed, owing to the nature of the organism and the nature of the conditions. 1869 1872

he
he
exposes
exposes
organic
organic
beings
beings
to
to
new
new
and
and
changing
changing
conditions
conditions
of
of
life,
life,
and
and
variability
variability
ensues;
ensues;
but
but
similar
similar
changes
changes
of
of
conditions
conditions
might
might
and
and
do
do
occur
occur
under
under
nature.
nature.
Let it
be
also be
borne in mind how infinitely complex and
closefitting
close-fitting
are the mutual relations of all organic beings to each other and to their physical conditions of
life.
life;
and consequently what infinitely varied diversities of structure
might
may
be of use to each being under changing conditions of life. Can it, then, be thought improbable, seeing that variations useful to man have undoubtedly occurred, that other variations useful in some way to each being in the great and complex battle of life, should
sometimes
sometimes
occur in the course of
many successive
thousands of
generations? If such do occur, can we doubt
(remem- bering
(remembering
that many more individuals are born than can possibly survive) that individuals having any advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed. This preservation of favourable variations and the
destruction
rejection
of injurious variations, I call Natural Selection. Variations neither useful nor injurious would not be affected by natural selection, and would be left
either a
a
fluctuating element, as perhaps we see in the species called polymorphic.
Several writers have misapprehended or objected to the term Natural Selection. Some have even imagined that natural selection induces variability, whereas it implies only the preservation of such variations as
arise
occur
and are beneficial to the being under its conditions of life. No one objects to agriculturists speaking of the potent effects of
mans
man's
selection; and in this case the individual differences given by nature, which man for some object selects, must of necessity first occur. Others