→ of their descendants, may be supposed to be 1859 1860 1861 1866 |
OMIT 1869 1872 |
|
→ to be as fine as 1859 1860 1861 1866 |
not greater than 1869 1872 |
|
→ or these parents from their ancient and unknown progenitor. 1859 1860 1861 1866 |
and descendants. 1869 1872 |
|
→ on 1859 1860 1861 1866 |
would be natural; for, on 1869 1872 |
|
→ from A, or from I, 1859 1860 1861 1866 |
for instance, from A, 1869 1872 |
|
→ We shall certainly 1859 1860 |
We shall assuredly 1861 1866 |
Assuredly we shall 1869 1872 |
|
→ many descendants from 1859 1860 1861 1866 |
descendants from 1869 |
descendants from any 1872 |
|
→ although having few characters in common, 1859 1860 1861 |
although having but few characters in common, 1866 |
OMIT 1869 1872 |
|
link in each branch and sub-branch
→of their descendants, may be supposed to be
still alive; and the links
→to be as fine as
those between
varieties. In this case it would be quite impossible to give
by which the several members of the several groups could be distinguished from their more immediate
→or these parents from their ancient and unknown progenitor. Yet the
arrangement in the diagram would still hold
→on
the principle of inheritance, all the forms
→from A, or from I,
would have something in common. In a tree we can
this or that branch, though at the actual fork the two unite and blend together. We could not, as I have said, define the several groups; but we could pick out types, or forms, representing most of the characters of each group, whether large or small, and thus give a general idea of the value of the differences between them. This is what we should be driven to, if we were ever to succeed in collecting all the forms in any
which have lived throughout all time and space.
→We shall certainly
never succeed in making so perfect a collection: nevertheless, in certain classes, we are tending
this
and Milne Edwards has lately insisted, in an able paper, on the high importance of looking to types, whether or not we can separate and define the groups to which such types belong. |
|
Finally, we have seen that natural selection, which
from the struggle for existence, and which almost inevitably
extinction and divergence of character in the
→many descendants from
one
parent-species, explains that great and universal feature in the affinities of all organic beings, namely, their
in group under group. We use the element of descent in classing the individuals of both sexes and of all
→although having few characters in common,
|