* * * * * *
Transcriber's note:
The punctuation of illustration captions was made consistent throughout.
Obvious typographical errors were corrected without comment.
Ambiguous spellings (e.g., colour and color--both in use) and other UK-US
spellings were not changed.
Some inconsistent hyphenation (e.g., toenail/toe-nail) was left as in
the original.
Chapter XIV in the Table of Contents was wrongly shown as page 123, and
this was changed to 133. Likewise chapter XLV in the Table of Contents
was wrongly shown as page 425, and this was changed to 426.