4. Carat character (^) is used to indicate "raised to power". And the underscore character (_) is used to represent subscript. 5. The greek letter alpha is represented as [alpha] in this text. 6. A mixed fraction is indicated with a hyphen and forward slash. For example, 3-1/2 represents three and a half. 7. The following misprints have been corrected: "1/0000" corrected to "1/1000" (page 111) "strucure" corrected to "structure" (page 139) "fevric" corrected to "ferric" (page 141) "d'antorite" corrected to "d'autorite" (page 188) "resourses" corrected to "resources" (page 206) 8. Other than the corrections listed above, printer's inconsistencies in spelling, punctuation, and ligature usage have been retained.