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1859
1860
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1872

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1860
1861
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1869
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peculiarities 1859 1860 1861 1866 1869
in our domestic animals peculiarities 1872

in our domestic animals (as the wattle in male carriers, horn-like protuberances in the cocks of certain fowls, &c.), which we cannot believe to be either useful to the males in battle, or attractive to the females. 1859 1860 1861 1866
in our domestic animals (as the greater development of the wattle in male carrier-pigeons, horn-like protuberances in certain fowls, &c.), which are in no way useful. 1869
which apparently have not been augmented through selection by man. 1872

can 1859 1860 1861 1866
cannot be useful and can 1869

either useful or ornamental to this bird;— 1859 1860 1861 1866
orna- mental;— 1869

1 blocks not present in 1859 1860 1861 1866 1869 1872; present in

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

see no reason to doubt that 1859 1860
OMIT 1861 1866 1869 1872

this, than 1859 1860 1861 1866 1869
that this would be the result, than 1872

can 1859 1860 1861 1866 1869
should be able to 1872

unconscious 1859 1860 1861 1866 1869
kind of unconscious 1872

males, in their weapons, means of defence, or
charms,
charms;
which they
and
having
have
transmitted
these advantages
these advantages
to their male
off-spring.
offspring alone.
offspring.
Yet, I would not wish to attribute all
such
such
sexual differences to this agency: for we see peculiarities arising and becoming attached to the male
sex,
sex
in our domestic animals (as the wattle in male carriers, horn-like protuberances in the cocks of certain fowls, &c.), which we cannot believe to be either useful to the males in battle, or attractive to the females. We see analogous cases under
nature,—
nature,
for instance, the tuft of hair on the breast of the turkey-cock, which can hardly be either useful or ornamental to this bird;— indeed, had the tuft appeared under domestication, it would have been called a monstrosity.
Illustrations
Illustrations
of
of
the
the
Action
action
of
of
Natural
Natural
Selection .—
In order to make it clear how, as I believe, natural selection acts, I must beg permission to give one or two imaginary illustrations. Let us take the case of a wolf, which preys on various animals, securing some by
cralt,
craft,
some by strength, and some by fleetness; and let us suppose that the fleetest prey, a deer for instance, had from any change in the country increased in numbers, or that other prey had decreased in numbers, during that season of the year when the wolf
was
is
hardest pressed for food.
I can
I can
Under
under
such circumstances see no reason to doubt that the swiftest and slimmest wolves would have the best chance of surviving, and so be preserved or selected,— provided always that they retained strength to master their prey at this or
at
at
some other period of the year, when they
were
might be
compelled to prey on other animals. I can see no more reason to doubt this, than that man can improve the fleetness of his
grey-hounds
greyhounds
by careful and methodical selection, or by
that
that
unconscious selection which
follows
results
from each man trying