Nowhere is this new attitude better illustrated than in pneumonia. Frank and unquestioned infection as it is, wreaking two-thirds of its visible damage in the lung itself, the liability to its occurrence and the outlook for its cure depend almost wholly upon the general vigor and rallying power of the entire body. It is perfectly idle to endeavor to avoid it by measures directed toward the protection of the lung or of the air-passages, and equally futile to attempt to arrest its course by treatment directed to the lung, or even the chest. The best place to wear a chest-protector is on the soles of the feet, and poulticing the chest for pneumonia is about as effective as shampooing the scalp for brain-fag. This clears the ground of a good many ancient misconceptions; for instance, that the chief cause of pneumonia is direct exposure to cold or a wetting, or the inhalation of raw, cold air. Few beliefs were more firmly fixed in the popular mind--and, for the matter of that, in the medical--up to fifteen or twenty years ago. It has found its way into literature; and the hero of the shipwreck in an icy gale or of weeks of wandering in the Frozen North, who must be offered up for artistic reasons as a sacrifice to the plot, invariably dies a victim of pneumonia, from his "frightful exposure," just as the victim of disappointed love dies of "a broken heart," or the man who sees the ambitions of years come crashing about his ears, or the woman who has lost all that makes life worth living, invariably develops "brain fever."