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The Variation of Animals and Plants Under Domestication, Volume II (of 2)   By: (1809-1882)

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THE VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION.

by

CHARLES DARWIN, M.A., F.R.S., &c.

IN TWO VOLUMES. VOL. II.

With Illustrations.

LONDON: John Murray, Albemarle Street. 1868.

The right of Translation is reserved.

London: Printed by William Clowes and Sons, Stamford Street, and Charing Cross.

{iii}

CONTENTS OF VOLUME II.

CHAPTER XII.

INHERITANCE.

WONDERFUL NATURE OF INHERITANCE PEDIGREES OF OUR DOMESTICATED ANIMALS INHERITANCE NOT DUE TO CHANCE TRIFLING CHARACTERS INHERITED DISEASES INHERITED PECULIARITIES IN THE EYE INHERITED DISEASES IN THE HORSE LONGEVITY AND VIGOUR ASYMMETRICAL DEVIATIONS OF STRUCTURE POLYDACTYLISM AND REGROWTH OF SUPERNUMERARY DIGITS AFTER AMPUTATION CASES OF SEVERAL CHILDREN SIMILARLY AFFECTED FROM NON AFFECTED PARENTS WEAK AND FLUCTUATING INHERITANCE: IN WEEPING TREES, IN DWARFNESS, COLOUR OF FRUIT AND FLOWERS, COLOUR OF HORSES NON INHERITANCE IN CERTAIN CASES INHERITANCE OF STRUCTURE AND HABITS OVERBORNE BY HOSTILE CONDITIONS OF LIFE, BY INCESSANTLY RECURRING VARIABILITY, AND BY REVERSION CONCLUSION ... Page 1

CHAPTER 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 ... Page 28

CHAPTER 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 ... Page 62

{iv}

CHAPTER 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 HAVE BRED TRUE FROM THEIR FIRST PRODUCTION ON THE CROSSING OF DISTINCT SPECIES IN RELATION TO THE FORMATION OF DOMESTIC RACES ... Page 85

CHAPTER XVI.

CAUSES WHICH INTERFERE WITH THE FREE CROSSING OF VARIETIES INFLUENCE OF DOMESTICATION ON FERTILITY.

DIFFICULTIES IN JUDGING OF THE FERTILITY OF VARIETIES WHEN CROSSED VARIOUS CAUSES WHICH KEEP VARIETIES DISTINCT, AS THE PERIOD OF BREEDING AND SEXUAL PREFERENCE VARIETIES OF WHEAT SAID TO BE STERILE WHEN CROSSED VARIETIES OF MAIZE, VERBASCUM, HOLLYHOCK, GOURDS, MELONS, AND TOBACCO, RENDERED IN SOME DEGREE MUTUALLY STERILE DOMESTICATION ELIMINATES THE TENDENCY TO STERILITY NATURAL TO SPECIES WHEN CROSSED ON THE INCREASED FERTILITY OF UNCROSSED ANIMALS AND PLANTS FROM DOMESTICATION AND CULTIVATION ... Continue reading book >>


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