| →
compared
,
1861 |
|
compared,
1859 1860 |
|
compared,
1866 1869 |
|
compared
,
1872 |
|
| → is 1859 1860 1861 1866 |
| in both cases is 1869 1872 |
|
| → cases both of 1859 1860 1861 1866 |
| instances of both 1869 1872 |
|
|
→
compared
,
|
| Independently of the question of fertility, the offspring of species
and of varieties when crossed may be compared in several other respects. Gärtner, whose strong wish
to draw a
line
between species and varieties, could find very
and, as it seems to me, quite unimportant differences between the so-called hybrid offspring of species, and the so-called mongrel offspring of varieties. And, on the other hand, they agree most closely in
many important respects. |
|
| I shall here discuss this subject with extreme brevity. The most important distinction is, that in the first generation mongrels are more variable than hybrids; but Gärtner admits that hybrids from species which have long been cultivated are often variable in the first generation; and I have myself seen striking instances of this fact. Gärtner further admits that hybrids between very closely allied species are more variable 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
|
