The Variation of Animals and Plants under Domestication, vol 2 | Page 3

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This etext was prepared by Sue Asscher [email protected]
from the etext prepared by Robert J. Robbins, PhD of the ESP Project
http://www.esp.org/rjr

THE VARIATION OF
ANIMALS AND PLANTS
UNDER DOMESTICATION
BY
CHARLES DARWIN, M.A., F.R.S., ETC.
IN TWO VOLUMES
VOLUME II.

CONTENTS.
CHAPTER 2.
XIII.--INHERITANCE continued--REVERSION OR ATAVISM.
DIFFERENT FORMS OF REVERSION--IN PURE OR UNCROSSED
BREEDS, AS IN PIGEONS, FOWLS, HORNLESS CATTLE AND
SHEEP, IN CULTIVATED PLANTS--REVERSION IN FERAL
ANIMALS AND PLANTS--REVERSION IN CROSSED VARIETIES
AND SPECIES--REVERSION THROUGH BUD-PROPAGATION,
AND BY SEGMENTS IN THE SAME FLOWER OR FRUIT--IN
DIFFERENT PARTS OF THE BODY IN THE SAME
ANIMAL--THE ACT OF CROSSING A DIRECT CAUSE OF
REVERSION, VARIOUS CASES OF, WITH INSTINCTS--OTHER
PROXIMATE CAUSES OF REVERSION--LATENT
CHARACTERS--SECONDARY SEXUAL
CHARACTERS--UNEQUAL DEVELOPMENT OF THE TWO
SIDES OF THE BODY--APPEARANCE WITH ADVANCING AGE
OF CHARACTERS DERIVED FROM A CROSS--THE GERM,
WITH ALL ITS LATENT CHARACTERS, A WONDERFUL
OBJECT--MONSTROSITIES--PELORIC FLOWERS DUE IN SOME
CASES TO REVERSION.

CHAPTER 2.
XIV.--INHERITANCE continued.--FIXEDNESS OF
CHARACTER--PREPOTENCY-- SEXUAL
LIMITATION--CORRESPONDENCE OF AGE.
FIXEDNESS OF CHARACTER APPARENTLY NOT DUE TO
ANTIQUITY OF INHERITANCE-- PREPOTENCY OF
TRANSMISSION IN INDIVIDUALS OF THE SAME FAMILY, IN
CROSSED BREEDS AND SPECIES; OFTEN STRONGER IN ONE
SEX THAN THE OTHER; SOMETIMES DUE TO THE SAME
CHARACTER BEING PRESENT AND VISIBLE IN ONE BREED
AND LATENT IN THE OTHER--INHERITANCE AS LIMITED BY
SEX--NEWLY-ACQUIRED CHARACTERS IN OUR
DOMESTICATED ANIMALS OFTEN TRANSMITTED BY ONE
SEX ALONE, SOMETIMES LOST BY ONE SEX
ALONE--INHERITANCE AT CORRESPONDING PERIODS OF
LIFE--THE IMPORTANCE OF THE PRINCIPLE WITH RESPECT
TO EMBRYOLOGY; AS EXHIBITED IN DOMESTICATED
ANIMALS: AS EXHIBITED IN THE APPEARANCE AND
DISAPPEARANCE OF INHERITED DISEASES; SOMETIMES
SUPERVENING EARLIER IN THE CHILD THAN IN THE
PARENT--SUMMARY OF THE THREE PRECEDING CHAPTERS.
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 CONDITIONS OF
LIFE, AND BY NATURAL SELECTION--ALL ORGANIC BEINGS
OCCASIONALLY INTERCROSS; APPARENT EXCEPTIONS--ON
CERTAIN CHARACTERS INCAPABLE OF FUSION; CHIEFLY
OR EXCLUSIVELY THOSE WHICH HAVE SUDDENLY

APPEARED IN THE INDIVIDUAL--ON THE MODIFICATION OF
OLD RACES, AND THE FORMATION OF NEW RACES BY
CROSSING--SOME CROSSED RACES