Origin of Species Variorum

→ endowment, but is 1859 1860 1861 1866

acquirement or endowment, but as 1869 1872

→ modifications, slowly impressed, by unknown means, on the reproductive systems of the parent-forms. 1866

slowly acquired modifications, more especially in the reproductive systems of the forms which are crossed. 1859 1860 1861

changes of an unknown nature in their sexual elements. 1869 1872

→ compared, 1866 1869

compared, 1859 1860

compared , 1861

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

a special →endowment, but is incidental on →modifications, slowly impressed, by unknown means, on the reproductive systems of the parent-forms.

Hybrids

and

Mongrels

→ compared,

independently

their

fertility .—

fertility .

Independently of the question of fertility, the offspring of species

~~when crossed~~

when crossed

and of varieties when crossed may be compared in several other respects. Gärtner, whose strong wish

was

it was

to draw a

marked

distinct

line

of distinction

....

between species and varieties, could find very

few

few,

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

very

....

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

generations,

generations

an extreme amount of variability in

the

their

offspring →is

notori- ous;

notorious;

but some few →cases both of hybrids and mongrels long retaining

a uniform

uniformity of

character could be given. The variability, however, in the successive generations of mongrels is, perhaps, greater than in hybrids.