Comparison with 1866 |
|
preservation, explains, I believe, some singular facts in nature,
such as that of very rare plants being sometimes extremely abundant
in the few spots where they do occur;
and that of some social plants being social, that is,
abounding in individuals, even on the extreme confines
of their range. For in such cases, we may believe, that a plant could exist only where the conditions of its life were so favourable that many could exist together, and thus save each other
from utter destruction. I should add that the good effects of frequent
intercrossing, and the ill effects of close interbreeding, probably
come into play in some
of these cases; but on this intricate subject
I will not here enlarge.
|
Complex
Complex
1866 1872 |
Complex
1869 |
Relations
Relations
1866 1872 |
Relations
1869 |
of
all
Animals
Animals
1866 1872 |
Animals
1869 |
and
Plants
Plants
1866 1872 |
Plants
1869 |
to
each
other
other
1866 1872 |
other
1869 |
in
the
Struggle
Struggle
1866 1872 |
Struggle
1869 |
for
Existence.
Existence.
1866 1872 |
Existence.
1869 |
..
|
Many cases are on record showing how complex and unexpected are the checks and relations between organic beings, which have to struggle together in the same country. I will give only a single instance, which, though a simple one, has
interested me. In Staffordshire, on the estate of a relation
where I had ample means of investigation, there was a large and extremely barren heath, which had never been touched by the hand of man; but several hundred acres of exactly the same nature had been enclosed twenty-five years previously and planted with Scotch fir. The change in the native vegetation of the planted part of the heath was most remarkable, more than is generally seen in passing from one quite different soil to another: not only the proportional numbers of the heath-plants were wholly changed, but twelve species of plants (not counting grasses and carices) flourished in the plantations, which could not be found on the heath. The effect on the insects must have been still greater, for
|
preservation, explains, I believe, some singular facts in
nature, nature, 1859 1860 1861 1866 1869 | nature 1872 |
such as that of very rare plants being sometimes extremely
abundant abundant 1859 1860 1861 1866 1869 | abundant, 1872 |
in the few spots where they do
occur; occur; 1859 1860 1861 1866 1869 | exist; 1872 |
and that of some social plants being social, that
is, is, 1859 1860 1861 1866 1869 | is 1872 |
abounding in individuals, even on the extreme
confines confines 1859 1860 1861 1866 1869 | verge 1872 |
of their range. For in such cases, we may believe, that a plant could exist only where the conditions of its life were so favourable that many could exist together, and thus save
the species the species 1860 1861 1866 1869 1872 | each other 1859 |
from utter destruction. I should add that the good effects of
frequent frequent 1859 1860 1861 1866 1869 | frequent 1872 |
intercrossing, and the ill effects of close interbreeding,
probably probably 1859 1860 1861 1866 1869 | no doubt 1872 |
come into play in
some some 1859 1860 1861 1866 1869 | many 1872 |
of these cases; but
on this intricate subject on this intricate subject 1859 1860 1861 1866 1869 |
OMIT 1872 |
I will not here
enlarge. enlarge. 1859 1860 1861 1866 1869 |
enlarge on this subject. 1872 |
|
Complex
Complex
1869 |
Complex
1866 1872 |
Relations
Relations
1869 |
Relations
1866 1872 |
of
all
Animals
Animals
1869 |
Animals
1866 1872 |
and
Plants
Plants
1869 |
Plants
1866 1872 |
to
each
other
other
1869 |
other
1866 1872 |
in
the
Struggle
Struggle
1869 |
Struggle
1866 1872 |
for
Existence.
Existence.
1869 |
Existence.
1866 1872 |
|
Many cases are on record showing how complex and unexpected are the checks and relations between organic beings, which have to struggle together in the same country. I will give only a single instance, which, though a simple one,
has has 1859 1860 1861 1866 1869 | has 1872 |
interested me. In Staffordshire, on the estate of a
relation, relation, 1860 1861 1866 1869 1872 | relation 1859 |
where I had ample means of investigation, there was a large and extremely barren heath, which had never been touched by the hand of man; but several hundred acres of exactly the same nature had been enclosed twenty-five years previously and planted with Scotch fir. The change in the native vegetation of the planted part of the heath was most remarkable, more than is generally seen in passing from one quite different soil to another: not only the proportional numbers of the heath-plants were wholly changed, but twelve species of plants (not counting grasses and carices) flourished in the plantations, which could not be found on the heath. The effect on the insects must have been still greater, for
|