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, 1861 1866 | food 1859 1860 |
and and 1859 1861 1866 | or 1860 |
...OMIT 1861 1866 |
from light, and 1859 1860 |
perhaps the thickness of fur from climate. ↑Subtitle not present 1859 1860 1861 |
Hilaire;
Correlation
of
Growth;
Inheritance.
1866 |
|
Habit also has a decided influence, 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 |
as in the period of
flowering with flowering with 1859 1860 1861 1866 |
the flowering of 1869 1872 |
plants when transported from one climate to another.
In In 1859 1860 1861 1866 1869 | With 1872 |
animals
it has it has 1859 1860 1861 1866 |
they have 1869 |
the increased use or disuse of parts has had 1872 |
a more marked
effect; for instance, effect; for instance, 1859 1860 1861 1866 1869 |
influence; thus 1872 |
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 I presume that 1859 1860 1861 1866 |
OMIT 1869 1872 |
this change may be safely attributed to the domestic duck flying much less, and walking more, than its wild
parent. parent. 1859 1860 1861 1866 | parents. 1869 1872 |
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 the state of 1859 1860 1861 1866 1869 |
OMIT 1872 |
these organs in other countries, is
another another 1859 1860 1861 | probably another 1866 1869 1872 |
instance of the
effect effect 1859 1860 1861 | effects 1866 1869 1872 |
of use. Not
a single a single 1859 1860 1861 1866 |
one of our 1869 1872 |
domestic
animal animal 1859 1860 1861 1866 | animals 1869 1872 |
can be named which has not in some country drooping ears; and the view
suggested by some authors, suggested by some authors, 1859 1860 1861 |
which has been suggested 1866 1869 1872 |
that the drooping is due to the disuse of the muscles of the ear, from the animals
not not 1859 1860 1861 | not 1866 1869 1872 |
being
much alarmed by danger, much alarmed by danger, 1859 1860 1861 |
seldom alarmed by danger, 1866 1869 |
seldom much alarmed, 1872 |
seems probable. |
|
There are There are 1859 1860 1861 1866 | There are 1869 1872 |
many many 1859 1860 1861 1866 | Many 1869 1872 |
laws
regulating regulating 1859 1860 1861 1866 | regulate 1869 1872 |
variation, some few of which can be dimly seen, and will
be hereafter be hereafter 1859 1860 1861 1866 | hereafter be 1869 1872 |
briefly
mentioned. mentioned. 1859 1860 1861 1866 | discussed. 1869 1872 |
I will here only allude to what may be called
correlation correlation 1859 1860 1861 1866 | correlated 1869 1872 |
of growth. of growth. 1859 1860 1861 1866 | variation. 1869 1872 |
Any Any 1859 1860 1861 1866 | Important 1869 1872 |
change change 1859 1860 1861 1866 | changes 1869 1872 |
in the embryo or larva will
almost certainly almost certainly 1859 1860 1861 | probably 1866 1869 1872 |
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.
|