The Variation of Animals and Plants under Domestication, vol 1 | Page 6

43. Second Edition Volume II., Page 17.
An additional case of reversion due to a cross.
First Edition, Volume II., Page 72. Second Edition Volume II., Page 48.
Inheritance as limited by sex.
First Edition, Volume II., Page 105. Second Edition Volume II., Page
83. Two varieties of maize which cannot be crossed.
First Edition, Volume II., Page 120. Second Edition Volume II., Page
99. Some additional facts on the advantages of cross-breeding in
animals.
First Edition, Volume II., Page 123. Second Edition Volume II., Page
103. Discussion on the effects of close interbreeding in the case of man.
First Edition, Volume II., Page 135 to 141. Second Edition Volume II.,
Page 117 to 122. Additional cases of plants sterile with pollen from the
same plant.
First Edition, Volume II., Page 149. Second Edition Volume II., Page
131. Mr. Sclater on the infertility of animals under confinement.
First Edition, Volume II., Page 152. Second Edition Volume II., Page
134. The Aperea a distinct species from the Guinea-pig.
First Edition, Volume II., Page 230. Second Edition Volume II., Page
215. Professor Jager on hawks killing light-coloured pigeons.
First Edition, Volume II., Page 273. Second Edition Volume II., Page
262. Professor Weismann on the effects of isolation in the development
of species.
First Edition, Volume II., Page 281. Second Edition Volume II., Page
271. The direct action of the conditions of life in causing variation.
First Edition, Volume II., Page 317. Second Edition Volume II., Page
309. Mr. Romanes on rudimentary parts.
First Edition, Volume II., Page 324 to 328. Second Edition Volume II.,
Page 316 to 327. Some additional cases of correlated variability.
First Edition, Volume II., Page 339. Second Edition Volume II., Page
333. On Geoffroy St.-Hilaire's law of "soi pour soi."
First Edition, Volume II., Page 357 to 404. Second Edition Volume II.,
Page 349 to 399. The chapter on Pangenesis has been largely altered

and re-modelled; but the essential principles remain the same.

THE VARIATION OF ANIMALS AND PLANTS UNDER
DOMESTICATION.
INTRODUCTION.
The object of this work is not to describe all the many races of animals
which have been domesticated by man, and of the plants which have
been cultivated by him; even if I possessed the requisite knowledge, so
gigantic an undertaking would be here superfluous. It is my intention to
give under the head of each species only such facts as I have been able
to collect or observe, showing the amount and nature of the changes
which animals and plants have undergone whilst under man's dominion,
or which bear on the general principles of variation. In one case alone,
namely in that of the domestic pigeon, I will describe fully all the chief
races, their history, the amount and nature of their differences, and the
probable steps by which they have been formed. I have selected this
case, because, as we shall hereafter see, the materials are better than in
any other; and one case fully described will in fact illustrate all others.
But I shall also describe domesticated rabbits, fowls, and ducks, with
considerable fulness.
The subjects discussed in this volume are so connected that it is not a
little difficult to decide how they can be best arranged. I have
determined in the first part to give, under the heads of the various
animals and plants, a large body of facts, some of which may at first
appear but little related to our subject, and to devote the latter part to
general discussions. Whenever I have found it necessary to give
numerous details, in support of any proposition or conclusion, small
type has been used. (Here shown with [].) The reader will, I think, find
this plan a convenience, for, if he does not doubt the conclusion or care
about the details, he can easily pass them over; yet I may be permitted
to say that some of the discussions thus printed deserve attention, at
least from the professed naturalist.
It may be useful to those who have read nothing about Natural
Selection, if I here give a brief sketch of the whole subject and of its
bearing on the origin of species. (Introduction/1. To any one who has
attentively read my 'Origin of Species' this Introduction will be
superfluous. As I stated in that work that I should soon publish the facts

on which the conclusions given in it were founded, I here beg
permission to remark that the great delay in publishing this first work
has been caused by continued ill- health.) This is the more desirable, as
it is impossible in the present work to avoid many allusions to
questions which will be fully discussed in future volumes.
From a remote period, in all parts of the world, man has subjected
many animals and plants to domestication or culture. Man