See page in:
1859
1860
1861
1866
1869
1872

Compare with:
1859
1860
1866
1869
1872

in a state of nature— had been 1859 1860 1861
in a state of nature — had been 1866 1869
under nature— were 1872

much greater variability, as well as the greater frequency of monstrosities, 1859 1860 1861 1866
fact of variations and monstrosities occurring much more frequently 1869 1872

leads to the belief that deviations of structure are in some way due 1861 1866
leads me to believe that deviations of structure are in some way due 1859 1860
and the greater variability of species having wide ranges than of those having restricted ranges, lead 1869
and the greater variability of species having wide ranges than of those with restricted ranges, lead 1872

nature of 1859 1860 1861 1866
conclusion that variability is directly related to 1869
conclusion that variability is generally related to 1872

the parents and their more remote ancestors have 1859 1860 1861 1866
each species has 1869 1872

I have remarked in 1859 1860 1861 1866
In 1869 1872

chapter— but a long catalogue of facts which cannot be here given would be necessary 1859 1860 1861
chapter — but a long catalogue of facts which cannot be here given would be necessary 1866
chapter I attempted 1869 1872

the truth of the remark— that 1859 1860 1861
the truth of the remark — that 1866
that changed conditions act in two ways, directly on the whole organization or on certain parts alone, and indirectly through 1869
that changed conditions act in two ways, directly on the whole organisation or on certain parts alone, and indirectly through 1872

CHAPTER V.
LAWS OF VARIATION.
Effects of
changed
external
conditions — Use and disuse, combined with natural selection; organs of flight and of vision — Acclimatisation —
Correlated
Correlation
variation
of growth
— Compensation and economy of growth — False correlations — Multiple, rudimentary, and lowly organised structures variable — Parts developed in an unusual manner are highly variable: specific characters more variable than generic: secondary sexual characters variable — Species of the same genus vary in an analogous manner — Reversions to
long lost
long-lost
characters — Summary.
I HAVE hitherto sometimes spoken as if the
variations —
variations—
so common and multiform
with
in
organic beings under domestication, and in a lesser degree
with
in
those in a state of nature— had been due to chance. This, of course, is a wholly incorrect expression, but it serves to acknowledge plainly our ignorance of the cause of each particular variation. Some authors believe it to be as much the function of the reproductive system to produce individual differences, or
very
very
slight deviations of structure, as to make the child like its parents. But the much greater variability, as well as the greater frequency of monstrosities, under domestication
or cultivation,
or cultivation,
than under nature, leads to the belief that deviations of structure are in some way due to the nature of the conditions of
life
life,
to which the parents and their more remote ancestors have been exposed during several
successive generations.
generations.
I have remarked in the first chapter— but a long catalogue of facts which cannot be here given would be necessary to show the truth of the remark— that the reproductive
system.
system
is
is
eminently
eminently