The _treatment_, on the same broad principle, resolves itself into relieving the congested organs, breaking the chain of morbid actions on which fever depends, equalizing the circulation, and lastly, by the adoption of a course of medicinal agents, correcting the vitiated state of the secretions, and restoring the functions to a healthy performance of their several duties. To effect the first it is often found necessary to bleed, or else by leeches, cupping, or blisters, relieve the overloaded organs; the second object is generally effected by an emetic, which in some instances it becomes necessary to repeat. The warm, the hot, or the shower bath, or aspersions of cold vinegar and water, are the means employed to effect an equalization of the circulation, and restore blood and warmth to the surface. The therapeutic means to be employed during the career of a fever, must depend entirely upon the character of the disease to be treated, and will be entered upon more particularly under their several heads. A remarkable peculiarity belonging to all fevers, is a periodicity of the disease, or a property that all fevers have of arranging their effects into periods of regular sections; as, first, into fits and paroxysms, then into remissions, and finally into critical days. Most fevers have three stages, called the _cold_, _hot_, and _sweating_; in some, these divisions are perfect and distinct, in others, broken and imperfect; these fits following in regular order, comprise a paroxysm, which may return at certain hours or only at irregular periods. The critical days are regarded as the 3, 5, 7, 9, 11, 14, 17, and 20; and the non-critical days are the intervening ones. The ages at which persons are most liable to fever, are from 20 to 30, and in the following order, gradually declining from 30 to 40, 40 to 50, and 50 to 60. As respects sex, females are more subject to fever than males, but only in a small degree. All fevers are not infectious, but those that are so are communicated by contact, exposure to the atmosphere surrounding a fever patient, and whatever depresses the mind or weakens the body, predisposes the system to infection. The best preventive against the worst form of fever, is cleanliness, a cheerful disposition, and an active body. BRAIN FEVER.