Joan Mark offers an interpretive biography of Patrick Tracy Lowell Putnam (1904-53), who spent twenty-five years living among the Bambuti pygmies of the Ituri Forest in what is now Zaire. On the Epulu River he constructed Camp Putnam as a harmonious multiracial community. He modeled his camp on the "dude ranches" of the American West, taking in paying guests while running a medical clinic and occasionally offering legal aid to the local people, and...