MARK TWAIN, BUSINESS MANedited by Samuel Charles Webster'Little, Brown ($4).
Everybody was inventing something when Mark Twain was writing some of the greatest U.S. fiction ever penned; so Mark, to whom nothing American was alien, was bound to catch the fever. "An inventor is a poeta true poet!" he cried, when his brother, Orion Clemens, invented a "modest little drilling machine." "To invent. . . shows the presence of the patrician blood of intellectthat 'round & top of sovereignty' which separates its possessor from the common multitude & marks him as one not...