The text reproduced here is the Fourth Revised Edition, updated by Graham in 1971–1972 and initially published in 1973. Please be advised that the text of Graham’s original footnotes (designated in his chapters with superscript numerals) can be found in the Endnotes section beginning on p. 579. The new footnotes that Jason Zweig has introduced appear at the bottom of Graham’s pages (and, in the typeface used here, as occasional additions to Graham’s endnotes).