Origin of Species Variorum

→ living 1859 1860 1861 1866 1869

any two living 1872

→ groups. 1859 1860 1861 1866 1869

groups of species. 1872

→ the 1859 1860 1861 1866 1869

or groups, the 1872

→ I apprehend that 1859 1860 1861 1866

OMIT 1869 1872

→ would have to 1859 1860 1861 1866

certainly 1869 1872

→ from each other 1859 1860 1861 1866

OMIT 1869 1872

→ of the same two groups would be distinguished 1859 1860 1861 1866

are separated 1869 1872

→ quite distinct, at that period made some small 1859 1860 1861 1866

quite distinct, made at that period a somewhat nearer 1869

made a somewhat nearer 1872

→ other. 1859 1860 1861 1866 1869

other than they now do. 1872

Some writers have objected to any extinct

species,

species

or group of

species,

species

being considered as intermediate between →living

species,

species

or →groups. If by this term it is meant that an extinct form is directly intermediate in all its characters between two living

forms

forms,

→the objection is

probably

....

valid. But →I apprehend that in a

~~perfectly~~

perfectly

natural classification many fossil species →would have to stand between living species, and some extinct genera between living genera, even between genera belonging to distinct families. The most common case, especially with respect to very distinct groups, such as fish and reptiles, seems to be,

that,

that

supposing them to be distinguished at the present day →from each other by a

score of

dozen

characters, the ancient members →of the same two groups would be distinguished by a somewhat lesser number of

characters;

characters,

so that the two

groups

groups,

~~though~~

though

formerly →quite distinct, at that period made some small approach to each →other.

It is a common belief that the more ancient a form is, by so much the more it tends to connect by some of its characters groups now widely separated from each other. This remark no doubt must be restricted to those groups which have undergone much change in the course of geological ages; and it would be difficult to prove the truth of the proposition, for every now and then even a living animal, as the Lepidosiren, is

dis- covered

discovered

having affinities directed towards very distinct groups. Yet if we compare the older Reptiles and Batrachians, the older Fish, the older Cephalopods, and the eocene Mammals, with the more recent members of the same classes, we must admit that there is

~~some~~

some

truth in the remark.

Let us see how far these several facts and inferences accord with the theory of descent with modification. As the subject is somewhat complex, I must request the