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ADDITIONS AND CORRECTIONS, TO THE Sixth EDITION
.. Page ix
VARIATION UNDER DOMESTICATION.
Causes of Variability—Effects of Habit and the use or disuse of
Parts - Correlated Variation - Inheritance — Character of
Variability - Individual differences — Doubtful species — Wide
tanging, much diffused, and common species, vary most,
STRUGGLE FOR EXISTENCE.
Geometrical ratio of increase-Rapid increase of naturalised
power on characters of trifling importance—its power at all
LAWS OF VARIATION.
Effects of changed conditions—Use and disuse, combined with
natural selection; organs of flight and of vision-Acclimatisa-
DIFFICULTIES OF THE THEORY.
Difficulties of the theory of descent with modification-Absence or
rarity of transitional varieties-Transitions in habits of life-
MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL
Longevity_Modifications not necessarily simultaneous—Modifica-
tions apparently of no direct service Progressive development
Instincts comparable with habits, but different in their origin-
Instincts graduated-Aphides and ants—Instincts variable
INSTRUCTION TO BINDER.
The Diagram to front page 140, Vol. i., 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 Moulinié; 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