In the _First Section_, of the different Method, to be employed in the cure of Feavers, not only in respect of the differing constitutions and ages of the patients, but also in regard of the differing seasons of one and the same year, and of the difference of one year from another. As to the _Former_, he shews, in what sorts of _Patients_, and at what time of the Feaver, Phlebotomy, or Vomiting, or both, are to be used; and when and where not: In what space of time the _Depuration_ if nature be not disturbed or hindred in her work, will be perform'd: When _Purgatives_ are to be administred: How that _Diarrhea's_ happen, if the _Patient_ had in the {211} beginning of the Feaver an inclination to vomit, but no vomit was given; and that those symptoms, which commonly are imputed to a malignity, do, for the most part, proceed from the Relaxation of the tone of the Bloud, caused by Medicines too refrigerating, or by the unseasonable use of Glisters in the declination of the disease. As to the _Latter_, he observes, that one of the chief causes, rendring the Cure of Feavers so uncertain and unsuccessfull, is, that _Practitioners_ do accommodate their observations, they take from the successful cure of some Feavers in one season or the year, or in some one year, to that of all Feavers in any season, or in any year whatsoever. And here he observes, _first_, how vigorous the blood is in the _Spring_, and how dispirited in _Autumn_; and thence regulates the letting of bloud, and Vomiting, and the giving of Glisters. _Next_, how difficult it is, to assign the cause of the difference between the Feavers of _Several years_; and to prognosticate of the salubrity or insalubrity of the following part of the year: where yet he insinuates, that, when _Insects_ do swarm extraordinarily, and when Feavers and Agues (especially _Quartans_) appear very early, as about _Midsummer_, then _Autumn_ commonly proves very sickly. _Lastly_, what method and Cautions are to be used in the Cure of _Epidemical_ Feavers.