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1859
1860
1861
1866
1869
1872

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1859
1860
1861
1866
1872

are still common 1869 1872
common 1859 1860 1861 1866

the striking relation of nearly 1869 1872
nearly 1859 1860 1861 1866

OMIT 1869 1872
being related in the most striking manner 1859 1860 1861 1866

of those of 1869 1872
those of 1859 1860 1861 1866

of the other 1869 1872
other 1859 1860 1861 1866

can be arranged within a few great classes, in 1869 1872
constitute one grand natural system, with 1859 1860 1861 1866

forms 1869 1872
species and genera 1859 1860 1861 1866

in contradistinction to their adaptive resemblances, are 1869 1872
are 1859 1860 1861 1866

with the acquired grades of dif- ference, marked 1869
in which we have to discover the lines of descent 1859 1860 1861 1866
with the acquired grades of difference, marked 1872

areas, some identical species are still common to
both
both.
still
....
exist.
exist there.
....
Wherever many closely allied yet distinct species occur,
many
....
doubtful forms and varieties
of
belonging to
the same
species
groups
like-wise
likewise
occur. It is a rule of high generality that the inhabitants of each area are related to the inhabitants of the nearest source whence immigrants might have been derived. We see this in the striking relation of nearly all the plants and animals of the Galapagos archipelago, of Juan Fernandez, and of the other American
islands
islands,
OMIT to the plants and animals of the neighbouring American mainland; and of those of the Cape de Verde
archipelago,
archipelago
and of the other African islands to the African mainland. It must be admitted that these facts receive no explanation on the theory of creation.
The fact, as we have seen, that all past and present organic beings can be arranged within a few great classes, in
group
groups
subordinate to
group,
groups,
and with
extinct
the extinct
groups often falling in between
recent
the recent
groups, is intelligible on the theory of natural selection with its contingencies of extinction and divergence of character. On these same principles we see how it is, that the mutual affinities of the forms within each class are so complex and circuitous. We see why certain characters are far more serviceable than others for classification;— why adaptive characters, though of paramount importance to the
being,
beings;
beings,
are of hardly any importance in classification; why characters derived from rudimentary parts, though of no service to the
being,
beings,
are often of high classificatory value; and why embryological characters are
the
often the
most valuable of all. The real affinities of all organic
beings
beings,
in contradistinction to their adaptive resemblances, are due to inheritance or community of descent. The
natural
Natural
system
System
is a genealogical arrangement, with the acquired grades of dif- ference, marked