Note: Confronted with the eternally vexed question of footnotes versus endnotes, I have opted for the former. If footnotes resemble the subtitles of a foreign-language film, the repeated recourse to endnotes may be compared to obliging the spectator of that film to dash out of the auditorium every ten minutes to consult a bilingual phrase-book. Neither is entirely satisfactory, but I know which, as a reader, I prefer. G. A.