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1859
1860
1861
1866
1869
1872

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1860
1861
1866
1869
1872

petrels 1859 1860 1861
diving Hymenoptera, and petrels 1866 1869 1872

1 blocks not present in 1859 1860; present in 1861 1866 1869 1872
When it was first said that the sun stood still and the world turned round, the common sense of mankind declared the doctrine false; but the old saying of Vox populi , vox Dei , as every philosopher knows, can never be trusted in science.

very imperfect and simple, 1859 1860 1861
imperfect and simple, 1866
perfect and complex, 1869
complex and perfect can be shown to exist, 1872

can be shown to exist; 1859 1860 1861 1866
can be shown to exist, 1869
as is certainly the case; 1872

if 1859 1860 1861 1866 1872
as is certainly the case; if 1869

does vary ever so slightly, 1859 1860 1861
does vary ever so slightly 1866
ever slightly varies, 1869
ever varies 1872

or modification in the organ be ever 1859 1860 1861 1866
should ever be 1869
should be 1872

Creator to cause a being of one type to take the place of one
belonging to
of
another type; but this seems to me only
re- stating
re-stating
restating
the fact in dignified language. He who believes in the struggle for existence and in the principle of natural selection, will acknowledge that every organic being is constantly endeavouring to increase in numbers; and that if any one
varies
being varies
being vary
ever so little, either in habits or structure, and thus
gains
gain
an advantage over some other inhabitant of the
same country,
country,
it will seize on the place of that inhabitant, however different
that
it
may be from its own place. Hence it will cause him no surprise that there should be geese and frigate-birds with webbed feet,
either
either
living on the dry land
and
or most
rarely alighting on the water; that there should be long-toed
corncrakes,
corncrakes
living in meadows instead of in swamps; that there should be woodpeckers where
hardly
not
a tree grows; that there should be diving
thrushes
thrushes,
and petrels with the habits of auks.
Organs
Organs
of
of
extreme
extreme
Perfection
perfection
and
and
complication.
Complication .
Complication.
complication .—
To suppose that the
eye
eye,
with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest
possible
possible
degree.
Yet
Yet
Reason
reason
tells me, that if numerous gradations from
an
a
imperfect
simple
perfect
and
simple
imperfect
complex
eye to one very imperfect and simple, each grade being useful to its possessor, can be shown to exist; if further, the eye does vary ever so slightly, and the variations be inherited,
as
which
is
likewise certainly
certainly
the case; and if
such
any
variations
variation
or modification in the organ be ever useful to
any
an
animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could
have been
be
formed by natural