Obvious typos have been amended. Variations in spelling in the
original text have been retained, except where usage frequency was
used to determine the common spelling and/or hyphenation. These
amendments are listed at the end of the text. Minor printer errors
have been amended without note.
The INTRODUCTION mentioned in the Preface has been moved to Volume I
per author's intent. Color plate notations of specified birds have
been relocated to follow the title of the bird.
In this e-text the letters a and u with a macron are represented by
[=a] and [=u], respectively.