Passages in italics were indicated by _underscores_. Passages in bold were indicated by =equal signs=. Small caps were replaced with ALL CAPS. Throughout the document, the œ ligature was replaced with "oe". The illustrations have been moved so that they do not break up paragraphs and so that they are next to the text they illustrate. Errors in punctuation and inconsistent hyphenation were not corrected unless otherwise noted. On page 5, a period was added after "little or no benefit." On page 9,