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inheritance, and to having already 1859 1860 1861
inheritance and to having already 1866
their having 1869 1872

parents or 1859 1860 1861 1866
already dominant parents, as well as 1869 1872

new species. 1859 1860 1861
other new forms. 1866
new forms. 1869 1872

in both ways will 1859 1860 1861
will 1866
OMIT 1869 1872

correspond. 1859 1860 1861
correspond in their first appearance and final disappearance. 1866
correspond both in their first appearance and final disappearance. 1869 1872

were 1859 1860
rich in fossils, were 1861 1866 1869 1872

occurred 1859 1860 1861 1866
as far as fossils are concerned, occurred 1869 1872

forms dominant in the highest degree, wherever produced, would tend everywhere to prevail. As they prevailed, they would cause the extinction of other and inferior forms; and as these inferior forms would be allied in groups by inheritance, whole groups would tend slowly to disappear; though here and there a single member might long be enabled to survive.
Thus, as it seems to me, the parallel, and, taken in a large sense, simultaneous, succession of the same forms of life throughout the world, accords well with the principle of new species having been formed by dominant species spreading widely and varying; the new species thus produced being themselves
dominant,
dominant
owing to inheritance, and to having already had some advantage over their parents or over other
species,
species;
and
these
again spreading, varying, and producing new species. The
old forms
forms
which are beaten and which yield their places to the new and victorious forms, will generally be allied in groups, from inheriting some inferiority in common; and
therefore,
therefore
as new and improved groups spread throughout the world, old groups
will
will
disappear from the world; and the succession of forms in both ways will everywhere
tends
tend
to correspond.
There is one other remark connected with this subject worth making. I have given my reasons for believing that
most of
all
our
great
greater
fossiliferous
fossiliferous
formations,
formations
were deposited during periods of subsidence; and that blank intervals of vast
duration,
duration
occurred during the periods when the bed of the sea was either stationary or rising, and likewise when sediment was not thrown down quickly enough to embed and preserve organic remains. During these long and blank intervals I suppose that the inhabitants of each region underwent a considerable amount of modification and extinction, and that there was much migration from