But if a quotidian is formed from a quartan, when that has happened in the beginning(14), it is proper to abstain for two days; in the evening to make use of friction, and give only water to drink. On the third day it often happens, that the fit does not come. But whether it has appeared or not, food must be given after the time for the fit: and if it continue, the strictest abstinence possible must be enjoined for two days, and friction used every day. CHAP. XVIII. OF THE SEVERAL KINDS OF MADNESS AND THEIR CURE. I have now gone through the treatment of fevers. There remain other disorders of the body, which come on after them: some of which, that cannot be assigned(15) to any certain part, I shall immediately subjoin. I shall begin with madness, and treat of the first kind of it, which is both acute, and happens in a fever; the Greeks call it phrenitis[BE]. [BE] φρεν̃ιτις. First of all it is necessary to know, that sick people sometimes in a febrile paroxysm lose their judgment, and talk incoherently. Which, though it be not trifling, and cannot happen unless in a violent fever, yet is not equally dangerous; for it is commonly of short continuance: and when the violence of the fit is abated, the judgment presently returns. Nor does this kind of distemper require any other remedy, than what has been already directed for curing a fever. It becomes then a phrenitis, when the delirium begins to continue without interruption; or when the patient, though he still have his reason, yet forms to himself some vain images: it is perfect, when the mind gives itself up to these images. Now there are several kinds of it: for amongst phrenitic people some are merry, others sad; some are more easily commanded, and their disorder goes no farther than words; others grow outrageous, and do acts of violence; and of these last again some only employ force, others even make use of cunning, and present a specious appearance of judgment, while they are catching at opportunities of doing mischief; but they are discovered by the issue. Such of them as only rattle, or do no harm but in trifles, it is needless to load with severe restraints. Those, who are more violent in their actions, it is proper to bind, lest they should hurt either themselves or any other person. Nor should we trust any of them, if in order to get rid of his chains he pretends to be well, though he speak sensibly, and make lamentable complaints; because this is nothing else but the cunning of a mad person.