On the day that he shall expect the return of the fever, it is proper for him to rise before _its hour_, and exercise himself, and to endeavour to have its time coinciding with his exercise: for thus it is often dispelled. But if it has seized him in the midst of his exercise, in that case to give over. In a disorder of this kind the remedies are unction, friction, exercise, food and wine. If the belly is bound, it must be opened. Now these things are easily performed by the more robust; but if the patient be grown weak, gestation must stand instead of exercise. If he cannot even bear this, yet friction must be used. If this also when vehement distresses him, the cure must be confined to rest, unction, and diet: and care must be taken, lest any crudity change the distemper into a quotidian. For a quartan kills no body: but if it be changed into a quotidian, the patient is in a bad way: which however never happens, unless by the fault either of the patient or the physician. CHAP. XVI. THE CURE OF A DOUBLE QUARTAN. But if there are two quartans, and those exercises, which I have prescribed cannot be used, there is a necessity either entirely to rest, or if that is difficult, to walk gently, then sit down, with the feet and head carefully wrapped up; as often as the fit has come on, and gone off, to eat sparingly, and drink a little wine; at other times, unless the weakness be very great, to abstain. But if there is hardly any intermission between two fits, to take food after both are over: then in the interval both to move a little, and after unction to eat. Now since an inveterate quartan is very seldom cured unless in the spring, in that season especially attention must be given, that nothing be done, which may obstruct the recovery of health. And it is of service in an old quartan to alter now and then the manner of living, to change from wine to water, from water to wine, from mild food to such as is acrid, and on the contrary; to eat radish, then vomit, or open the belly by chicken broth; to add warming medicines to the oil for friction; before the fit to take two cyathi of vinegar, or one of mustard, with three of Greek salt wine; or pepper, castor, laser(13), and myrrh, mixed in equal proportions, and diluted with water; for by these, and such like the body must be agitated, that so a change may be made from its present state. If the fever has disappeared, it is proper to be long mindful of its periodical day; and on that day to guard against cold, heat, crudity, and fatigue: for it easily returns, unless it be feared for some time after the recovery of health. CHAP. XVII. THE CURE OF A QUOTIDIAN ARISING FROM A QUARTAN.