and individual must be
severe, severe, 1859 1860 1861 1866 1869 | very severe, 1872 |
we always find great diversity in its inhabitants. For instance, I found that a piece of turf, three feet by four in size, which had been exposed for many years to exactly the same conditions, supported twenty species of plants, and these belonged to eighteen genera and to eight orders, which shows how much these plants differed from each other. So it is with the plants and insects on small and uniform
islets; islets; 1859 1860 1861 1866 1869 | islets: 1872 |
and so and so 1859 1860 1861 1866 | also 1869 1872 |
in small ponds of fresh water. Farmers find that they can raise most food by a rotation of plants belonging to the most different
orders: orders: 1859 1860 1861 1866 1869 | orders; 1872 |
nature follows what may be called a simultaneous rotation. Most of the animals and plants which live close round any small piece of ground, could live on it (supposing
it it 1859 1860 1861 1866 1869 | its nature 1872 |
not to be in any way
peculiar peculiar 1859 1860 1861 1866 1869 | peculiar), 1872 |
in its nature), in its nature), 1859 1860 1861 1866 1869 |
OMIT 1872 |
and may be said to be striving to the utmost to live there; but, it is seen, that where they come into the closest
competition competition 1859 1860 1861 1866 1869 | competition, 1872 |
with each other, with each other, 1859 1860 1861 1866 1869 |
OMIT 1872 |
the advantages of diversification of structure, with the accompanying differences of habit and constitution, determine that the inhabitants, which thus jostle each other most closely, shall, as a general rule, belong to what we call different genera and orders. |
|
The same principle is seen in the naturalisation of plants through
man's man's 1859 1861 1866 1869 1872 | mans 1860 |
agency in foreign lands. It might have been expected that the plants which
have have 1859 1860 1861 1866 | would 1869 1872 |
succeeded succeeded 1859 1860 1861 1866 | succeed 1869 1872 |
in becoming naturalised in any land would generally have been closely allied to the indigenes; for these are commonly looked at as specially created and adapted for their own country. It
might, might, 1859 1860 1861 1866 | might 1869 1872 |
also,
perhaps, perhaps, 1866 1869 1872 | perhaps 1859 1860 1861 |
have been expected that naturalised plants would have belonged to a few groups more especially adapted to certain stations in their new homes. But the case is very different; and Alph.
de de 1861 1866 1869 1872 | De 1859 1860 |
Candolle has well
remarked remarked 1859 1860 1861 1866 1869 | remarked, 1872 |
in his great and admirable work, that floras gain by naturalisation, proportionally with the number
|