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1859
1860
1861
1866
1869
1872

Compare with:
1859
1861
1866
1869
1872

remembered 1860 1861 1866
borne in mind 1869 1872

examples: 1860 1861 1866
illustrations of the foregoing remarks: 1869 1872

nearly every land-bird, but only two out of the eleven marine birds, 1860
there are 26 land-birds; of these, 21 (or perhaps 23) 1861
there are 26 land-birds; of these 21 (or perhaps 23) 1866 1869 1872

and it is obvious that 1860
whereas of the 11 1861 1866 1869 1872

could 1860
only 2 are peculiar; and it is obvious that marine birds could 1861 1869 1872
only 2 are peculiar; and it is obvious that marine birds only 2 are peculiar; and it is obvious that marine birds could 1866

more easily 1860 1861 1866
much more easily and frequently 1869 1872

1 blocks not present in 1860 1861 1866 1869 1872; present in 1859
Thus in the Galapagos Islands nearly every land-bird, but only two out of the eleven marine birds, are peculiar; and it is obvious that marine birds could arrive at these islands more easily than land-birds.

one endemic land-bird; 1860 1861 1866
one endemic land bird; 1859
a single endemic land-bird; 1869 1872

during their great annual migrations, visit either periodically or occasionally 1859 1860 1861
occasionally visit 1866
occasionally or even frequently visit 1869 1872

by 1859 1860 1861 1866
from the neighbouring continents with 1869 1872

struggled together in their former homes, and have 1859 1860 1861 1866
struggled together, and 1869
there struggled together, and have 1872

adapted to each other; and when settled in their new homes, each kind will have been kept by the others to their proper places and habits, and will consequently have been little liable to modification. 1859 1860 1861
adapted to each other; and when settled in their new homes, each kind will have been kept by the others to its proper place and habits, and will consequently have been little liable to modification. 1866
adapted; hence when settled in their new homes, each kind would be kept by the others to its proper place and habits, and would consequently be but little liable to modification. 1869
co-adapted. 1872

from 1860 1861 1866 1869
often arriving from 1872

far more easily than land- shells, across three or four hundred miles of open sea. 1860
far more easily than land-shells, across three or four hundred miles of open sea. 1859 1861 1866
across three or four hundred miles of open sea far more easily than land-shells. 1869 1872

should be remembered that the offspring of such crosses would
almost
almost
certainly gain in vigour; so that even an occasional cross would produce more effect than might
at first
at first
be
have been
anticipated.
I will
To
give a few examples: in the Galapagos Islands nearly every land-bird, but only two out of the eleven marine birds, are
peculiar,
peculiar;
and it is obvious that marine birds could arrive at these islands more easily than land-birds. Bermuda, on the other hand, which lies at about the same distance from North America as the Galapagos Islands do from South America, and which has a very peculiar soil, does not possess one endemic land-bird; and we know from Mr. J. M.
Joness
Jones's
admirable account of Bermuda, that very many North American
birds
birds,
during their great annual migrations, visit either periodically or occasionally this island. Madeira does not possess one peculiar bird, and many European and African birds are almost every year blown there, as I am informed by Mr. E. V. Harcourt. So that
the two
the
these two
Islands
islands
of Bermuda and Madeira have been stocked by birds, which for long ages have struggled together in their former homes, and have become mutually adapted to each other; and when settled in their new homes, each kind will have been kept by the others to their proper places and habits, and will consequently have been little liable to modification. Any tendency to modification
will
would
will,
also
also,
be
have been
checked by intercrossing with the unmodified
immigrants,
immigrants
from the mother-country.
Madeira
Madeira,
again
again,
is inhabited by a wonderful number of peculiar land-shells, whereas not one species of sea-shell is
peculiar
confined
to its
shores;
shores:
now, though we do not know how sea-shells are dispersed, yet we can see that their eggs or larvæ, perhaps attached to
sea-weed
seaweed
or floating timber, or to the feet of wading-birds, might be transported far more easily than land- shells, across three or four hundred miles of open sea.