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OMIT 1866
to the extinct and unknown 1859 1860 1861
is to the extinct and unknown, 1869 1872

is very small 1866
is very small, 1859 1860 1861
OMIT 1869 1872

compared with the extinct and unknown forms, I 1866
I 1859 1860 1861 1869 1872

It certainly is true, that new organs very rarely or never suddenly appear in any class, as if created for some special purpose; as indeed is 1866
The truth of this remark is indeed 1859 1860
It certainly is not true, that new organs often appear suddenly in any class, as if created for some special purpose; as indeed is 1861
It certainly is true, that new organs appearing as if specially created for some purpose, rarely or never appear suddenly in any class; as indeed is 1869
It certainly is true, that new organs appearing as if created for some special purpose, rarely or never appear in any being;— as indeed is 1872

but somewhat exaggerated, canon 1861 1866 1869 1872
canon 1859
but somewhat exaggerated canon 1860

so much variety and so little novelty? 1866 1869
so? 1859 1860 1861
so much variety and so little real novelty? 1872

sudden leap, 1866 1869
leap, 1859 1860 1861
great and sudden leap, 1872

short and sure though slow 1866 1869
the shortest and slowest 1859 1860
short and slow 1861
short and sure, though slow 1872

Importance, as affected by Natural Selection. 1866
importance .— 1859 1860 1861
Importance, as affected by Natural Selection. 1869
Importance, as affected by Natural Selection . 1872

individuals with any favourable variation, 1859 1860 1861 1866
the fittest, 1869 1872

those with any unfavourable deviation of structure,—I have sometimes felt much difficulty in understanding the origin of simple parts, of which the importance does not seem sufficient to cause the preservation of successively varying individuals. 1866
those with any unfavourable deviation of structure,— I have sometimes felt much difficulty in understanding the origin of simple parts, of which the importance does not seem sufficient to cause the preservation of successively varying individuals. 1859 1860 1861
the less well fitted individuals,—I have sometimes felt great difficulty in understanding the origin or formation of parts of little importance; almost as great, though of a very different kind, as in the case of the most perfect and complex organs. 1869
the less well-fitted individuals, 1872

conjecture by what transitions
an
many
....
organ
organs
could
....
have arrived at
its
their
present state; yet, considering
how small
that
the proportion of living and known forms OMIT is very small compared with the extinct and unknown forms, I have been astonished how rarely an organ can be named, towards which no transitional grade is known to lead. It certainly is true, that new organs very rarely or never suddenly appear in any class, as if created for some special purpose; as indeed is shown by that
old
old,
but somewhat exaggerated, canon in natural history of "Natura non facit saltum." We meet with this admission in the writings of almost every experienced naturalist;
or,
or
....
as Milne Edwards has well expressed it,
nature
Nature
is prodigal in variety, but niggard in innovation. Why, on the theory of Creation, should
this
there
be so much variety and so little novelty? Why should all the parts and organs of many independent beings, each supposed to have been separately created for its proper place in nature, be so
invariably
commonly
linked together by graduated steps? Why should not Nature
have
....
taken
take
a
leap
sudden leap
from structure to structure? On the theory of natural selection, we can clearly understand why she should not; for natural selection
can
....
act
acts
only by taking advantage of slight successive variations; she can never take a sudden leap, but must advance by short and sure though slow steps.
Organs
Organs
of
of
little
little
apparent
apparent
Importance, as affected by Natural Selection.
As natural selection acts by life and
death,—
death,—by
by
....
the
survival
preservation
of individuals with any favourable variation, and by the destruction of those with any unfavourable deviation of structure,—I have sometimes felt much difficulty in understanding the origin of simple parts, of which the importance does not seem sufficient to cause the preservation of successively varying individuals.