



Produced by Melissa McDaniel, Charlie Howard, Rachael
Schultz and the Online Distributed Proofreading Team at
http://www.pgdp.net (This file was produced from images
generously made available by The Internet Archive)







Transcriber's Note:

  Inconsistent hyphenation and spelling in the original document have
  been preserved. Obvious typographical errors have been corrected.

  Italic text is denoted by _underscores_ and bold text by =equal
  signs=.  Superscripts are prefixed with a ^caret.  In Table D on
  page 283, a symbol for "per" has been replaced with the word per.

  Footnote numbering, which in the original restarted at "1" with every
  chapter, has been prepended with OP (Original Preface), NP
  (New Preface), M (