Produced by Kevin Handy, Dave Maddock, Josephine Paolucci and the
Online Distributed Proofreading Team.
[Transcriber's notes: In the chemical equations, superscripts are indicated with a ^ and subscripts are indicated with a . The affected item is enclosed in curly brackets {}. Examples are H^{+} for hydrogen ion and H{2}O for water. Since the underscore is already being used in this project, italics are designated by an exclamation point before and after the italicized word or phrase.]