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These are the rules to be observed by such as are in health, that are only apprehensive of the cause. We next proceed to the cure of fevers, which is a kind of disease, that affects the whole body, and is the most common of all. Of these one is a quotidian, another a tertian, and a third a quartan. Sometimes some fevers also return after a longer period, but that seldom occurs. With regard to the former, they are both diseases in themselves, and a cure for others.

But quartan fevers are more simple. They begin commonly with a shuddering; then a heat breaks out; after the paroxysm is over, the patient is well for two days. So that it returns upon the fourth day.

Of tertians again there are two kinds. One of them both beginning and ending like the quartan; with this difference only, that there is one day’s intermission, and it returns upon the third. The other kind is much more fatal, which indeed returns upon the third day, but of forty-eight hours, thirty-six are occupied by the fit (and sometimes either less or more,) nor does it entirely cease in the remission; but is only mitigated. This kind most physicians call semitertian[BB].