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male 1859 1860
on the male 1861 1866 1869 1872

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

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

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 male element; in nearly the same manner as
in
in
the crossed 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
invariably
certainly
revert in character to their aboriginal stocks. Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature. I have in vain endeavoured to discover on what decisive facts the above statement has so often and so boldly been made. There would be great difficulty in proving its truth: we may safely conclude that very many of the most
strongly marked
strongly-marked
domestic varieties could not possibly live in a wild state. In many cases we do not know what the aboriginal stock was, and so could not tell whether or not nearly perfect reversion had ensued. It would be
quite
quite
necessary
necessary,
in order to prevent the effects of intercrossing, that only a