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Habit— Correlated Variation— 1869
Habit— Correlation of Growth— 1859 1860 1861 1866
Habit and the use or disuse of Parts— Correlated Variation— 1872

CHAPTER I.
VARIATION UNDER DOMESTICATION.
Causes of Variability— Effects of Habit— Correlated Variation— Inheritance— Character of Domestic Varieties— Difficulty of distinguishing between Varieties and Species— Origin of Domestic Varieties from one or more Species— Domestic Pigeons, their Differences and Origin—
Principle
Principles
of
Selection
Selection,
anciently followed,
its
their
Effects— Methodical and Unconscious Selection— Unknown Origin of our Domestic Productions— Circumstances favourable to Man's power of Selection.
Causes of Variability.
WHEN we
look to
compare
the individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes
us,
us
is, that they generally differ
much more
more
....
from each
other,
other
than
more than
do the individuals of any one species or variety in a state of nature.
When
And if
we reflect on the vast diversity of the plants and animals which have been cultivated, and which have varied during all ages under the most different climates and treatment,
I think
....
we are driven to conclude that this
greater
great
variability is
simply
....
due to our domestic productions having been raised under conditions of life not so uniform as, and somewhat different from, those to which the parent-species
have
had
been exposed under nature. There
is,
is
also,
I think,
I think,
some probability in the view propounded by Andrew Knight, that this variability may be partly connected with excess of food. It seems
pretty
....
clear that organic beings must be exposed during several generations to
the
....
new conditions
of life
....
to cause any
great
appreciable
amount of variation; and
that
that,
when the organisation has once begun to