PARIS — Fueled by a lattice of centuries-old timbers, the fire moved hungrily across Notre Dame's rooftop toward the cathedral's iconic spire. It belched yellow smoke, spitting out gritty particles of wood, stone, lead and iron and wanted more. Far below, their vision obscured by fumes and tears, firefighters, priests and municipal workers passed treasures hand-to-hand, hoping the speed of desperation could outrun the flames.