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1859
1860
1861
1866
1869
1872

Compare with:
1859
1861
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1872

modification — Transitions — Absence 1859 1860 1861 1869
modification—Transitions—Absence 1866
modification — Absence 1872

varieties — Transitions 1859 1860 1861 1869 1872
varieties—Transitions 1866

life — Diversified 1859 1860 1861 1869 1872
life—Diversified 1866

species — Species 1859 1860 1861 1869 1872
species—Species 1866

allies — Organs 1859 1860 1861 1869 1872
allies—Organs 1866

perfection — Means 1859 1860 1861
perfection—Modes 1866
perfection — Modes 1869 1872

transition — Cases 1859 1860 1861 1869 1872
transition—Cases 1866

difficulty — Natura 1859 1860 1861 1869 1872
difficulty—Natura 1866

saltum — Organs 1859 1860 1861 1869 1872
saltum—Organs 1866

importance — Organs 1859 1860 1861 1869 1872
importance—Organs 1866

perfect — The 1859 1860 1861 1869 1872
perfect—The 1866

having 1859 1860 1861 1866 1869
the reader has 1872

staggered; 1859 1860 1861 1866 1869
in some degree staggered; 1872

animal with wholly different 1859 1860 1861 1866
animal with widely-different 1869
other animal with widely different 1872

habits? 1859 1860 1861 1866
structure and habits? 1869
habits and structure? 1872

organs of such wonderful structure, 1859 1860 1861 1866 1869
an organ so wonderful 1872

CHAPTER VI.
DIFFICULTIES
OF THE
ON
THEORY.
Difficulties
of
on
the theory of descent with modification — Transitions — Absence or rarity of transitional varieties — Transitions in habits of life — Diversified habits in the same species — Species with habits widely different from those of their allies — Organs of extreme perfection — Means of transition — Cases of difficulty — Natura non facit saltum — Organs of small importance — Organs not in all cases absolutely perfect — The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection.
LONG before having arrived at this part of my work, a crowd of difficulties will have occurred to
him.
the reader.
Some of them are so
serious
grave
that to this day I can
hardly
never
reflect on them without being staggered; but, to the best of my judgment, the
greater
greater
number are only apparent, and those that are real are
greater not,
not,
I think, fatal to
the
my
theory.
These difficulties and objections may be classed under the following
heads:—Firstly,
heads:—First,
heads:— First,
heads:— Firstly,
why, if species have descended from other species by
insensibly
insensibly
fine gradations, do we not everywhere see innumerable transitional forms? Why is not all nature in
confusion,
confusion
instead of the species being, as we see them, well defined?
Secondly, is it possible that an animal having, for instance, the structure and habits of a bat, could have been formed by the modification of some animal with wholly different habits? Can we believe that natural selection could produce, on the one hand,
an organ
organs
of trifling importance, such as the tail of a giraffe, which serves as a fly-flapper, and, on the other hand, organs of such wonderful structure,