The Preface.
All Authors (very neer) who have writ of Feavers, do distinguish a pestilential Feaver from a malignant, and doe treat of each of them severally in divers Chapters; so that by the name of a pestilential Feaver they doe understand the true Pestilence or Plague; and by a such malignant Feaver, they mean that which is commonly called the sp••••ted Feaver, or such a Feaver which though it be epidemical and contagious, yet it is not so dangerous but that more live then die of it: whereas the true essence of the Plague consists in this that more die thereof than recover. But for as much as these Feavers differ one from another only according to the greater or lesser degree of malignity, and must be cured with the same Medicaments; we have thought it more convenient to include al these kind of Feavers in one Chapter, and to han∣dle them all under the name of Pestilential Feavers. and consequently this last Section shall con∣sist of two Chapters, the first of which shall treat of the Pestilentiall Feaver; and the later of the Measles and small Pox: For seeing a Malignant Feaver does allwaies attend them all Authors doe justly treat of them in this place.