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Additions And Corrections, To The Sixth Edition .. Page ix
Historical Sketch #_ x;j;
Variation Under Domestication.
Causes of Variability—Effects of Habit and the use or disuse of
Parts — Correlated Variation — Inheritance — Character of
Domestic Varieties—Difficulty of distinguishing between
Varieties and Species—Origin of domestic varieties from one or
, more species—Domestic Pigeons, their Differences and Origin—
Principles of Selection, anciently followed, their Effects
Methodical and Unconscious Selection—Unknown Origin of our
-^J CHAPTER IL
Variation Under Nature.
.+, Variability — Individual differences — Doubtful species Wide
ianging, much diffused, and common species, vary most
►H Species of the larger genera in each country vary more fre-
Q quently than the species of the smaller genera—Many of the
ZO closely, but unequally, related to each other, and in havin?
CO restricted ranges 5j
Struggle For Existence.
Its bearing on natural selection—The term used in a wide sense—
Natural Selection; Ob The Survival or The Fittest.
Natural Selection—its power compared with man's selection—its
Laws Of Variation.
Effects of changed conditions—Use and disuse, combined with
Difficulties Of The Theory.
Difficulties of the theory of descent with modification—Absence or
Miscellaneous Objections To The Theory Of Natural
Longevity—Modifications not necessarily simultaneous—Modifica-
Instincts comparable with habits, but different in their origin—
INSTRUCTION TO BINDER.
The Diagram to front page 140, VoL L, and to face the latter part
ADDITIONS AND CORRECTIONS
TO THE SIXTH EDITION.
Numerous small corrections have been made in the last and present editions on various subjects, according as the evidence has become somewhat stronger or weaker. The more important corrections and some additions in the present volume are tabulated on the following page, for the convenience of those interested in the subject, and who possess the fifth edition. The second edition was little more than a reprint of the first. The third edition was largely corrected and added to, and the fourth and fifth still more largely. As copies of the present work will be sent abroad, it may be of use if I specify the state of the foreign editions. The third French and second German editions were from the third English, with some few of the additions given in the fourth edition. A new fourth French edition has been translated by Colonel Moulinie; of which the first half is from the fifth English, and the latter half from the present edition. A third German edition, under the superintendence of Professor Victor Carus, was from the fourth English edition; a fifth is now preparing by the same author from the present volume. The second American edition was from the English second, with a