Origin of Species Variorum

→ belonging to large and 1869 1872

of the larger 1859 1860 1861 1866

→ has sometimes been a 1866 1869 1872

may often be a very 1859 1860 1861

↑ 2 blocks not present in 1872; present in 1859 1860 1861 1866 1869

We can understand how the spreading of the dominant forms of life, which are those that oftenest vary, will in the long run tend to people the world with allied, but modified, descendants; and these will generally succeed in taking the places of those groups of species which are their inferiors in the struggle for existence. Hence, after long intervals of time, the productions of the world will appear to have changed simultaneously.

→ dominant forms which spread widely and yield the greatest number of varieties tend to people the world with allied, but modified, descendants; and these will generally succeed in displacing the groups which are their inferiors in the struggle for existence. 1872

all the forms of life, ancient and recent, make together one grand system; for all are connected by generation. 1859 1860 1861 1866

all the forms of life, ancient and recent, make together a few grand classes; for all are at least thus far connected by generation. 1869

→ how it is that all the forms of life, ancient and recent, make together a few grand classes. We can understand, from 1872

from 1859 1860 1861 1866 1869

→ living; 1869 1872

living. 1859 1860 1861

living; why ancient and extinct forms often tend to fill up gaps between existing forms, sometimes blending two groups previously classed as distinct into one; but more commonly only bringing them a little closer together. 1866

→ bringing them only 1869 1872

only bringing them 1859 1860 1861

→ extinct and 1869 1872

extinct and very 1859 1860

other extinct and 1861 1866

→ OMIT 1869 1872

to each other, than are those of remote formations; 1859 1860 1861 1866

together, or at the same rate, or in the same degree; yet in the long run that all undergo modification to some extent. The extinction of old forms is the almost inevitable consequence of the production of new forms. We can understand why when a species has once disappeared it never reappears. Groups of species increase in numbers slowly, and endure for unequal periods of time; for the process of modification is necessarily slow, and depends on many complex contingencies. The dominant species →belonging to large and dominant groups tend to leave many modified descendants,

and thus

which form

new sub-groups and

groups

groups.

are

....

formed.

....

As these are formed, the species of the less vigorous groups, from their inferiority inherited from a common progenitor, tend to become extinct together, and to leave no modified offspring on the face of the earth. But the utter extinction of a whole group of species →has sometimes been a slow process, from the survival of a few descendants, lingering in protected and isolated situations. When a group has once wholly disappeared, it does not reappear; for the link of generation has been broken. ↑

We can understand how it is that →dominant forms which spread widely and yield the greatest number of varieties tend to people the world with allied, but modified, descendants; and these will generally succeed in displacing the groups which are their inferiors in the struggle for existence. Hence, after long intervals of time, the productions of the world will appear to have changed simultaneously. We can

understand,

understand

→how it is that all the forms of life, ancient and recent, make together a few grand classes. We can understand, from the continued tendency to divergence of character, why the more ancient a form is, the more it generally differs from those now →living;

Why

why

ancient and extinct forms often tend to fill up gaps between existing forms, sometimes blending two

groups

groups,

previ- ously

previously

classed as

distinct

distinct,

into one; but more commonly →bringing them only a little closer together. The more ancient a form is, the more

often,

often

apparently,

....

displays characters

stands

in some degree intermediate between groups now distinct; for the more ancient a form is, the more nearly it will be related to, and consequently resemble, the common progenitor of groups, since

be- come

become

widely divergent. Extinct forms are seldom directly intermediate between existing forms; but are intermediate only by a long and circuitous course through

many

other

→extinct and different forms. We can clearly see why the organic remains of closely consecutive formations are

....

closely

allied

allied;

→OMIT