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Show viii CONTENTS OF VOL. II. CHAPTEH XXVIII. CONCLUDING REMARKS. DOMESTICATION_ NATURE AND CAUSES OF VARIABILITY- SELECTION - DIVERGENCE AND DISTINCTNESS OF CHAUACTER- EXTINCTION OF RACES - CIHCU111- STANCES FAVOURABLE '1'0 SELECTION BY MAN- AN'£IQUITY OF CERTAIN RACESTHE QUESTION WHETHER EACH PARTICULAR VARIATION HAS BEEN SPECIALLY PRE;. .. . . P age 40<> ORDAINED .. I NDEX ERRATA. Vol. II., pp. 18, 232, 258, f or Cratregus oxycantha, read oxyacantha. , p. 98, 8 lines from top, for Dianthus armoria read armeria. , 156, 15 lines from bottom, f or Casuarinus read Casuarius. 4 lines from bottom for Grus cineria read cinerea. :: 1~8, 11 lines from top, f or CEsculus read lEsculus. , 300, 3 liues from top, f or anastomising read anastomosing. , , foot-note, f or Birckell read Brickell. 433 THE VARIATION OF ANIMALS AND PLANTS UNDEH DOMESTICATION. CHAPTEH XII. INHERITANCE. 'WONDERFUL NATURE OF INIIElUTANCE- PEDIGREES OF OUR D0li1ESTICATED ANIMALS - I~HERITAN CE NOT DUE '1'0 CIIANCE - 'l'RmLJNG CHARACTERS INIIE IUTED - DISEASES INIIERITED - PECULIARI'£IES IN THE EYE INlfE IUTED- DISEASES IN 'l'HE HOUSE- LONGEVITY AND VIGOUR- A YlllilffiTRICAL DE)'IATIO~S OF STRUCTURE - POLYDAC'l'YLISJ\1 AND REGROWTH OF SUPER~Ll\iERARY DIGITS AFTER Al\I:PUTATION - CASES OF SEV~RAL CHILDREN SDIILARLY AFFECTED FRQ:\1 NON-AFFECTED PARENTS - "WEAK AJ\'1) FLUCTUA'I.'I~G I NH.ERI 'I.'ANCE : IN WEEPING TREES, IN DWAUFNESS, COLOUR OF FRUIT AND FLOWERS, COLOUR OF HORSES- NONINHERITANCE IN CERTAIN CASES- L.'iH.ERITANCE OF STRUCTURE AND HABITS OVERBORNE BY liOSTILE CONDITIONS OF LIFE, BY INCESSANTLY RECU.RIUNG VARIABILITY, AND BY REVERSION - CONCLUSION. THE subject of inheritance is an immense one, and has been t reated by many authors. One work alone, 'De l'Heredite N aturelle,' by Dr. Prosper Lucas, runs to the length of 1562 pages. vV e must confine ourselves to certain points which have an important bearing on the general subject of variation, both. with domestic and natural productions. It is obvious that a Yariation which is not inherited throws no light on the derivation of species, nor is of any service to man, except in the case of perennial plants, whieh can be propagated by buds. If animals and plants had never been domesticated, and wild ones alone had been observed, we should probably never have heard the saying, that " like begets like." The proposition would have been as self-evident, as that all the buds on the same tree are alike, though neither proposition is strictly true. For, as has often been remarked, probably no two individuals are VOL. II. B |
