In the great majority of patients in whom the symptoms continue thus moderate, the disease disappears about the end of the second week; that is, they are convalescent at that period; but it usually requires eight or ten days longer before they have regained sufficient strength to leave the hospital. Sometimes, although there is no greater severity in the symptoms, the disease is more protracted, and the recovery is not complete until the fourth or even the fifth week. Beyond this period it is very rare for this form of the disease to be protracted. Almost all who are attacked with the malady in this, its mildest form, recover: but now and then it happens that the symptoms go on with this degree of moderation until about the end of the second week. Then at the period when it is usual for convalescence to take place there is no perceptible improvement; the patients seem even to grow weaker; they lie more prostrate in the bed, and they are soon incapable of moving; still they complain of no pain or uneasiness, and it is not easy to detect any trace of disease in any organ; yet it is but too evident that they grow worse, and ultimately they sink exhausted. In these cases, on examination after death, it is commonly found that disease has been preying on some vital organs, although its presence could not be detected during life; and this termination of the milder type of fever rarely happens, excepting in aged persons, whose constitutions have been enfeebled by previous diseases, or worn out by the various causes which depress and exhaust the powers of life.