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genera of these 1859 1860
endemic genera of the United 1861
genera naturally living in the United 1866
genera now living in the United 1869 1872

struggled 1859 1860 1861 1866 1869
in any country struggled 1872

of any country, 1859 1860 1861 1866 1869
OMIT 1872

in 1859 1860 1861 1866 1869
of structure in 1872

plants through
man's
mans
agency in foreign lands. It might have been expected that the plants which
would
have
succeed
succeeded
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,
also,
perhaps,
perhaps
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
Candolle has well
remarked,
remarked
in his great and admirable work, that floras gain by naturalisation, proportionally with the number of the native genera and species, far more in new genera than in new species. To give a single instance: in the last edition of Dr. Asa
Gray's
Grays
'Manual
Manual
of the Flora of the Northern United
States,'
States,
260 naturalised plants are enumerated, and these belong to 162 genera. We thus see that these naturalised plants are of a highly diversified nature. They differ, moreover, to a large
extent,
extent
from the indigenes, for out of the 162
naturalised genera,
genera,
no less than 100 genera are not there indigenous, and thus a large proportional addition is made to the genera of these States.
By considering the nature of the plants or animals which have struggled successfully with the
indigenes,
indigenes
of any country, and have there become naturalised, we
can
may
gain some crude idea in what manner some of the natives would have
had
....
to be modified, in order to
have gained
gain
an advantage over
the
the
their
other
compatriots;
natives;
and we
may,
may
I think,
....
at least
safely
safely
infer that diversification of structure, amounting to new generic differences, would
have been
be
profitable to them.
The advantage of diversification in the inhabitants of the same region is, in fact, the same as that of the physiological division of
labor
labour
in the organs of the same individual body— a subject so well elucidated by Milne