THE PRINCIPLES OF
BIOLOGY
BY
HERBERT SPENCER
IN TWO VOLUMES
VOL. II
REVISED AND ENLARGED EDITION
1899
NEW YORK
D. APPLETON AND COMPANY
1900
Copyright, 1867, 1899,
By D. APPLETON AND COMPANY.
PREFACE
TO THE REVISED AND ENLARGED EDITION OF VOL. II.
To the statements made in the preface to the first volume of this revised edition, there must here be added a few having special reference to this second volume.
One of them is that the revision has not been carried out in quite the same way, but in a way somewhat less complete. When reviewing the first volume a friendly critic, Prof. Lloyd Morgan, said:—