Fortunately, as with its twin brother, the grip, the bark of rheumatism is far worse than its bite; and a striking feature of the disease is its low fatality, especially when contrasted with the fury of its onslaught and the profoundness of the prostration which it produces. Though it will torture its victim almost to the limits of his endurance for days and even weeks at a stretch, it seldom kills directly. Its chief danger lies in the legacies which it bequeaths. Though, like nearly all fevers, it is self-limited, tends to run its course and subside when the body has manufactured an antitoxin in sufficient amounts, it is unique in another respect, and that is in the extraordinary variability of the length of its "course." This may range anywhere from ten days to as many weeks, the "average expectation of life" being about six weeks. The agonizing intensity of the pain and acute edge of the discomfort usually subside in from five to fifteen days, especially under competent care. When the temperature falls, the drenching sweats cease, the joints become less exquisitely painful, and the patient gradually begins to pull himself together and to feel as if life were once more worth living. He is not yet out of the woods, however, for while the pain is subsiding in the joints which have been first attacked, another joint may suddenly flare up within ten or twelve hours, and the whole distressing process be repeated, though usually on a somewhat milder and shorter scale. This uncertainty as to how many joints in the body may be attacked, is, in fact, one of the chief elements in making the duration of the disease so irregular and incalculable.