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1859
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1859
1860
1861
1869
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will apparently for ever be 1861 1866
is 1869 1872

under one important point of view 1861 1866
OMIT 1869 1872

the case of 1861 1866
OMIT 1869 1872

we must believe, 1866 1869
we may believe, 1861
by the indigenes, we must believe, that 1872

in the course of time 1866 1869
that in the course of time 1861
OMIT 1872

become 1861 1866 1869
in the course of time become 1872

the progress of this displacement in New Zealand, and from 1866
what we see now occurring in New Zealand, and from 1861
the fact that 1872
OMIT 1869

well doubt, 1866
doubt, 1861
well doubt whether, 1869 1872

may be said to be higher 1861 1866
stand much higher in the scale 1869 1872

insists 1859 1860 1861 1866
and several other highly competent judges insist 1869 1872

we knew that at some former period only ten thousand kinds
had
had
existed, we ought to look at this increase in number
in
of
the highest class, which implies a great displacement of lower forms, as a decided advance in the organisation of the
world.
world,
whether
whether
the
the
higher
higher
or
or
the
the
lower
lower
vertebrata
vertebrata
had
had
thus
thus
largely
largely
increased.
increased.
We
can
can
thus see how hopelessly difficult it will apparently for ever be to compare with perfect fairness, under such extremely complex relations, the standard of organisation of the imperfectly-known faunas of successive
periods.
periods
of
of
the
the
earth's
earth's
history.
history.
We shall appreciate under one important point of view this difficulty
the
the
more clearly, by looking to the case of certain existing faunas and floras. From the extraordinary manner in which European productions have recently spread over New Zealand, and have seized on places which must have been previously
occupied
occupied,
we must believe,
if
that if
all the animals and plants of Great Britain were set free in New Zealand, in the course of time a multitude of British forms would become thoroughly
naturalised
naturalized
there, and would exterminate many of the natives. On the other hand, from the progress of this displacement in New Zealand, and from hardly a single inhabitant of the southern hemisphere
has
having
become wild in any part of Europe, we may well doubt, if all the productions of New Zealand were set free in Great Britain,
whether
whether
any considerable number would be enabled to seize on places now occupied by our native plants and animals. Under this point of view, the productions of Great Britain may be said to be higher than those of New Zealand. Yet the most skilful
naturalist,
naturalist
from an examination of the species of the two
countries,
countries
could not have foreseen this result.
Agassiz insists that ancient animals resemble to a certain extent the embryos of recent animals
belonging to
of
the