seminal and bud generation, though often counteracted by various known and
unknown causes.

SECONDLY, reversion or atavism, which depends on transmission and development
being distinct powers: it acts in various degrees and manners through both
seminal and bud generation.

THIRDLY, prepotency of transmission, which may be confined to one sex, or be
common to both sexes.

FOURTHLY, transmission, as limited by sex, generally to the same sex in which
the inherited character first appeared; and this in many, probably most cases,
depends on the new character having first appeared at a rather late period of
life.

FIFTHLY, inheritance at corresponding periods of life, with some tendency to
the earlier development of the inherited character.

In these laws of Inheritance, as displayed under domestication, we see an
ample provision for the production, through variability and natural selection,
of new specific forms.


CHAPTER 2.XV.

ON CROSSING.

FREE INTERCROSSING OBLITERATES THE DIFFERENCES BETWEEN ALLIED BREEDS.
WHEN THE NUMBERS OF TWO COMMINGLING BREEDS ARE UNEQUAL, ONE ABSORBS THE OTHER.
THE RATE OF ABSORPTION DETERMINED BY PREPOTENCY OF TRANSMISSION, BY THE