Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

PREFACE TO TIHE SECOND EDITION.
THE flattering reception of my Essays by the public
and the press having led to a second edition being
called for within a year of its first publication, I have
taken the opportunity to make a few necessary corrections. I have also added a few passages to the
6th and 7th Essays, and have given two notes, explanatory of some portions of the last chapter which
appear to have been not always understood. These
additions are as follows:To avoid altering the paging the additional pages now given have
been lettered.
Ist Ed. 2nd Ed.
221 221 Additional facts as to birds acquiring the song of other species.
223 223A Mr. Spruce's remarks on young birds
223B pairing with old.
228 228A Pouchet's observations on a change
228B in the nests of swallows.
229 _ Passage omitted about nest of Golden
Crested Warbler, which had been
inserted on Rennie's authority, but
has not been confirmed by any later
observers.
261 261 Daines Barrington, on importance of
protection to the female bird.
372 Note A.
372n Note B.