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1859
1860
1861
1866
1869
1872

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1859
1860
1861
1866
1872

on the male 1861 1866 1869 1872
male 1859 1860

OMIT 1861 1866 1869
crossed 1859 1860
increased length of the horns in the 1872

the greater length of horn, 1859 1860 1861 1866 1869
OMIT 1872

transmitted from one sex to both sexes, or to one sex alone, more commonly but not exclusively to the like sex. It is a fact of some
little
....
importance to us, that peculiarities appearing in the males of our domestic breeds are often
transmitted
transmitted,
either
exclusively,
exclusively
or in a much greater degree, to
males
the males
alone. A much more important rule, which I think may be trusted, is that, at whatever period of life a peculiarity first appears, it tends to
appear
re-appear
in the offspring at a corresponding age, though sometimes earlier. In many cases this could not be
otherwise;
otherwise:
thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature; peculiarities in the
silk-worm
silkworm
are known to appear at the corresponding caterpillar or cocoon stage. But hereditary diseases and some other facts make me believe that the rule has a wider extension, and
that
that,
when there is no apparent reason why a peculiarity should appear at any particular age, yet that it does tend to appear in the offspring at the same period at which it first appeared in the parent. I believe this rule to be of the highest importance in explaining the laws of embryology. These remarks are of course confined to the first appearance of the peculiarity, and not to
the
its
primary
cause
cause,
which may have acted on the ovules or on the male element; in nearly the same manner as
in
in
the OMIT offspring from a short-horned cow by a long-horned bull, the greater length of horn, though appearing late in life, is clearly due to the male element.
Having alluded to the subject of reversion, I may here refer to a statement often made by naturalists — namely, that our domestic varieties, when run wild, gradually but
certainly
invariably
revert in character to their aboriginal stocks. Hence it has been argued that no deductions can be drawn from domestic races to species