AIN
DIFFERENCES OF COLOUR IN BIRDS TO THEIR MODE OF NIDIFICATION.

First published in the "Journal of Travel and Natural History" (No. 2),
1868. Now reprinted with considerable emendations and additions, by
which I have endeavoured more clearly to express, and more fully to
illustrate, my meaning in those parts which have been misunderstood by
my critics.

VIII.--CREATION BY LAW.

First published in the "Quarterly Journal of Science," October, 1867.
Now reprinted with a few alterations and additions.

IX.--THE DEVELOPMENT OF HUMAN RACES UNDER THE LAW OF NATURAL SELECTION.

First published in the "Anthropological Review," May, 1864. Now
reprinted with a few important alterations and additions. I had intended
to have considerably extended this essay, but on attempting it I found
that I should probably weaken the effect without adding much to the
argument. I have therefore preferred to leave it as it was first
written, with the exception of a few ill-considered passages which never
fully expressed my meaning. As it now stands, I believe it contains the
enunciation of an important truth.

X.--THE LIMITS OF NATURAL SELECTION AS APPLIED TO MAN.

This is the further development of a few sentences at the end of an
article on "Geological Time and the Origin of Species," which appeared
in the "Quarterly Review," for April, 1869. I have here ventured to
touch on a class of problems which are usually considered to be beyond
the boundaries of science, but which, I believe, will one day be brought
within her domain.

* * * * *

For the convenience of those who are acquainted with any of my essays in
their original form, I subjoin references to the more important
additions and alterations now made to them.

_ADDITIONS AND CORRECTIONS TO THE ESSAYS AS ORIGINALLY PUBLISHED_.

Essays I. and II. are unaltered, but short notes are added at pp. 19,
24, 29, and 40.

III.--_Mimicry, and other Protective Resemblances among Animals._

PAGE

53 Additional illustration of protective colouring in the case of
the wood-dove and the robin.

63 On moths resembling bird's dung and mortar.

86 Correction of some names of African Papilios and a reference to
Mr. Trimen's observations.

89 Mr. Jenner Weir's observation on birds which refused to eat
_Spilosoma menthrasti_.

102 An additional case of snake mimicry in _Oxyrhopus trigeminus_.

107 Mr.