Out of bounds: The Andover (Mass.) public library, for banishing eager-to-read children to a kiddie room and keeping them away from most books. Library director Nancy Jacobson thinks the kids make too much noise. If youngsters below the seventh grade want to browse for books beyond the "Horton Hears a Who" variety. she says, they must have an adult chaperone them--hardly the best way to encourage higher learning. But the kids are fighting back: one is circulating a petition among third to fifth graders demanding that children be allowed to browse with the big people and the Massachusetts Civil Liberties Union is considering a lawsuit.