Late in the summer of 1880, a wave of odors enveloped large portions of Paris. As the stench lingered, outraged residents feared that the foul air would breed an epidemic. Fifteen years later--when the City of Light was in the grips of another Great Stink--the public conversation about health and disease had changed dramatically. Parisians held their noses and protested, but this time few feared that the odors would spread disease. Historian...