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action of natural selection accords perfectly 1859 1860 1861 1866
results of natural selection accord perfectly 1869
results accord 1872

his powers of 1859 1860 1861 1866
OMIT 1869 1872

selection. 1859 1860 1861 1866
selection or the survival of the fittest. 1869
selection, that is by the survival of the fittest. 1872

Extinction .— 1859
Extinction.1860 1861
Extinction caused by Natural Selection. 1866 1872
Extinction caused by Natural Selection. 1869

But as from 1859 1860
From 1861 1866
Owing to 1869 1872

inhabitants, 1859 1860
the full number of its existing inhabitants, and as most areas are already stocked with a great diversity of forms, 1861 1866 1869
inhabitants; 1872

it follows 1859 1860 1861 1866 1869
and it follows from this, 1872

each selected and 1859 1860 1861 1866 1869
the 1872

represented 1859 1860 1861 1866 1869
which is represented 1872

during 1859 1860 1861 1866 1869
run a good chance of utter extinction, during great 1872

seasons or 1859 1860 1861 1866 1869
nature of the seasons, or from a temporary increase 1872

continually and slowly being 1859 1860 1861 1866 1869
OMIT 1872

the number of 1859 1860 1861 1866 1869
OMIT 1872

goes on perpetually and almost 1859 1860 1861 1866 1869
can go on 1872

numbers inevitably 1859 1860 1861
many inevitably 1866 1869
in number, many old forms 1872

shows us plainly; and indeed we can see reason why they should not have thus increased, for 1859 1860
tells us plainly; and we shall presently attempt to show why it is that 1861 1866 1869
plainly tells us; and we shall presently attempt to show why it is that 1872

places in the polity of nature is not indefinitely great,— not that we have any means of knowing that any one region has as yet got its maximum of species. 1859 1860
species throughout the world has not become immeasurably great. 1861 1866 1869 1872

action of natural selection accords perfectly
well
well
with what geology tells us of the rate and manner at which the inhabitants of
the
this
world have changed.
Slow though the process of selection may be, if feeble man can do much by his powers of artificial selection, I can see no limit to the amount of change, to the beauty and
infinite
infinite
complexity of the coadaptations between all organic beings, one with another and with their physical conditions of life, which may
have been
be
affected
effected
in the long course of time
through
by
nature's power of selection.
Extinction .—
This subject will be more fully discussed in our chapter on Geology; but it must
here be
be here
alluded to from being intimately connected with natural selection. Natural selection acts solely through the preservation of variations in some way advantageous, which consequently endure. But as from the high geometrical
ratio
rate
powers
of increase of all organic beings, each area is already
fully
fully
stocked with inhabitants, it follows
that,
that
as each selected and favoured
forms
form
increase
increases
in number,
so, generally,
so
generally will
will
the less favoured
forms
forms
decrease and become rare. Rarity, as geology tells us, is the precursor to extinction. We
can
can,
also,
also,
see that any form represented by few individuals
will
will,
during fluctuations in the seasons or in the number of its
enemies.
enemies,
run
run
a
a
good
good
chance
chance
of
of
utter
utter
extinction.
extinction.
But we may go further than this;
for,
for
as new forms are continually and slowly being produced, unless we
admit
believe
that the number of specific forms goes on perpetually and almost indefinitely
increasing
increasing,
numbers inevitably must become extinct. That the number of specific forms has not indefinitely increased, geology shows us plainly; and indeed we can see reason why they should not have thus increased, for the number of places in the polity of nature is not indefinitely great,— not that we have any means of knowing that any one region has as yet got its maximum of species.