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OMIT 1861 1866
from light, and 1859 1860

←Subtitle not present 1859 1860 1861 Hilaire; Correlation of Growth; Inheritance. 1866
Habit also has a decided influence, 1859 1860 1861 1866
Habits are inherited and have a decided influence; 1869
Changed habits produce an inherited effect, 1872

flowering with 1859 1860 1861 1866
the flowering of 1869 1872

it has 1859 1860 1861 1866
they have 1869
the increased use or disuse of parts has had 1872

effect; for instance, 1859 1860 1861 1866 1869
influence; thus 1872

I presume that 1859 1860 1861 1866
OMIT 1869 1872

the state of 1859 1860 1861 1866 1869
OMIT 1872

a single 1859 1860 1861 1866
one of our 1869 1872

suggested by some authors, 1859 1860 1861
which has been suggested 1866 1869 1872

much alarmed by danger, 1859 1860 1861
seldom alarmed by danger, 1866 1869
seldom much alarmed, 1872

can be shown that quite opposite conditions produce similar changes of structure. Nevertheless some slight amount of change may, I think, be attributed to the direct action of the conditions of life — as, in some cases, increased size from amount of food, colour from particular kinds of
food
food,
or
and
OMIT perhaps the thickness of fur from climate.
Habit also has a decided influence, as in the period of flowering with plants when transported from one climate to another.
With
In
animals it has a more marked effect; for instance, I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more, in proportion to the whole skeleton, than do the same bones in the wild-duck; and I presume that this change may be safely attributed to the domestic duck flying much less, and walking more, than its wild
parents.
parent.
The great and inherited development of the udders in cows and goats in countries where they are habitually milked, in comparison with the state of these organs in other countries, is
probably another
another
instance of the
effects
effect
of use. Not a single domestic
animals
animal
can be named which has not in some country drooping ears; and the view suggested by some authors, that the drooping is due to the disuse of the muscles of the ear, from the animals
not
not
being much alarmed by danger, seems probable.
There are
There are
Many
many
laws
regulate
regulating
variation, some few of which can be dimly seen, and will
hereafter be
be hereafter
briefly
discussed.
mentioned.
I will here only allude to what may be called
correlated
correlation
variation.
of growth.
Important
Any
changes
change
in the embryo or larva will
probably
almost certainly
entail changes in the mature animal. In monstrosities, the correlations between quite distinct parts are very curious; and many instances are given in Isidore Geoffroy St. Hilaire's great work on this subject. Breeders believe that long limbs are almost always accompanied by an elongated head.