The _Small-Pox_ is somewhat like the _Sore-Plague_, not only by being Infectious, as both sorts of Plagues are; but, by being of a corrupt Nature, as the Sore-Plague is; only the _Small-Pox_ is innumerable, or very many small Sores; whereas the _Sore-Plague_ is but one or two great Sores. Also, the _Small-Pox_ and _Sore-Plague_, are alike in this, That if they rise and break, or if they fall not flat, but remain until they be dry and scabbed, the Patient lives: but, if they fall flat, and neither break, nor are scabbed, the Patient is in danger to dye. Also, it is to be noted, That this Disease is sometimes accompanied with a Feverish Distemper; I say, Sometimes, not Always; and that is the cause that many dye, either with too hot, or too cooling Applications: for, in a Feverish Distemper, hot Cordials are Poyson; and when there is no Fever, Cooling Remedies are _Opium_: The like for letting Blood; for if the Disease be accompanied with a Fever, and the Fever be not abated by letting Blood, 'tis probable the Fever, joyned with the Pox, will destroy the Patient: and if no Fever, and yet loose Blood, the Pox hath not sufficient Moisture to dilate, nor a sufficient natural Vapour to breathe, or respirate; so as the Life of the Patient is choaked or stifled with the contracted Corruptions. As for Measles, though they are of the same kind, yet not of the same sort; for they are rather Small Risings, than Corrupted Sores, and so are less dangerous. CHAP. IV. Of the Intermission of Fevers or Agues. _Agues_ have several sorts of Distempers, and those quite opposite to each other, as Cold and Shaking, Hot and Burning, besides Sweating: Also, there are several times of Intermissions; as some are Every-day Agues, some Third-day Agues, and some _Quartan_ Agues; and some Patient may be thus distempered, many times, in the compass of Four and twenty hours: but those are rather of the Nature of Intermitting Fevers, than of perfect Agues. Also, in Agues, there is many times a difference of the Hot and Cold fits: for sometimes the Cold Fits will be long, and the Hot short; other times, the Hot Fits will be long, and the Cold Fits short; other times, much of an equal degree: but, most Intermitting Fevers and Agues, proceed either from ill-digestive Motions, or from a superfluity of Cold and Hot Motions, or an Irregularity of the Cold, Hot, Dry; or Moist Motions, where each sort strives and struggles with each other. But, to make a comparison, Agues are somewhat like several sorts of Weather, as Freezing and Thawing,