The visit took place. It was a formidable campaign; a nocturnal battle against pestilence and suffocation. It was, at the same time, a voyage of discovery. One of the survivors of this expedition, an intelligent workingman, who was very young at the time, related curious details with regard to it, several years ago, which Bruneseau thought himself obliged to omit in his report to the prefect of police, as unworthy of official style. The processes of disinfection were, at that epoch, extremely rudimentary. Hardly had Bruneseau crossed the first articulations of that subterranean network, when eight laborers out of the twenty refused