| → in its nature), 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → with each other, 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
|
and individual must be
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
in small ponds of fresh water. Farmers find that they can raise most food by a rotation of plants belonging to the most different
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
not to be in any way
→in its nature),
and may be said to be striving to the utmost to live there; but, it is seen, that where they come into the closest
→with each other,
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
agency in foreign lands. It might have been expected that the plants which
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
also,
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.
Candolle has well
in his great and admirable work, that floras gain by naturalisation, proportionally with the number
|
