Origin of Species Variorum

→ 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,

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

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

variation.

Important

changes

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.