| → is 1859 1860 1861 1866 |
| in both cases is 1869 1872 |
|
| → cases both of 1859 1860 1861 1866 |
| instances of both 1869 1872 |
|
| → in most cases 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → and therefore we might expect that such variability 1859 1860 1861 1866 |
| which 1869 1872 |
|
| → be superadded to 1860 1866 |
| be super-added to 1859 1861 |
| be added to 1869 |
| would augment 1872 |
|
| → cross or in the first 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → their extreme variability in 1859 1860 1861 1866 |
| that in 1872 |
| OMIT 1869 |
|
| → on 1859 1860 1861 1866 |
| of one of 1869 1872 |
|
| → it is due to 1859 1860 1861 1866 |
| OMIT 1869 1872 |
|
| → being thus often rendered either impotent or at least incapable of 1859 1860 1861 1866 |
| fails under these circumstances to perform 1869 1872 |
|
| → identical with 1859 1860 1861 1866 |
| identical in all respects with 1869 |
| closely similar in all respects to 1872 |
|
|
than those from very distinct species; and this shows that the difference in the degree of variability graduates away. When mongrels and the more fertile hybrids are propagated for several
an extreme amount of variability in
offspring
→is
but some few
→cases both of
hybrids and mongrels long retaining
character could be given. The variability, however, in the successive generations of mongrels is, perhaps, greater than in hybrids. |
|
| This greater variability
mongrels than
hybrids does not seem
at all surprising. For the parents of mongrels are varieties, and mostly domestic varieties (very few experiments having been tried on natural varieties), and this implies
→in most cases
that there has been recent
→and therefore we might expect that such variability
would often continue and
→be superadded to
that arising from the
act of crossing. The slight
of
in
the first
→cross or in the first
generation, in contrast with
→their extreme variability in
the succeeding generations, is a curious fact and deserves attention. For it bears on
the view which I have taken
→on
the
of ordinary
namely, that
→it is due to
the reproductive system
eminently sensitive to
conditions of life,
→being thus often rendered either impotent or at least incapable of
its proper function of producing offspring
→identical with
the parent-form. Now hybrids in the first generation are descended from species (excluding those
which have not had their reproductive systems in any way affected, and they are not variable; but hybrids themselves have their reproductive systems seriously affected, and their descendants are highly variable. |
|
| But to return to our comparison of mongrels and
|
