i oo Of the manife/i Signs other Times the firft Fit would be gentle, and the fubfequent very fevere and intenfe * 7 and truly fuch was the Uncertainty and Difguife of this infidious Enemy, that no- thing could be prognosticated of its Attacks or Cruelty. B U T to come at fome tolerable Notion of the Reafon for fuch Uncertainty :, it is to be enquired, FIRST, What Caufe can be ailigned for fuch and uncertain Return of the Paroxyfms ? And, SECONDLY, What Reafon can be gi- ven for the unequal Exacerbations when the Fits do recur ? CAN any one doubt what Tumults and Diforders may be excited in the Blood, and other animal juices, by that ialine Sem'mium of a Peftilence, which we have already de- fcribed ? The uncertainty then of fuch Dif- order* muft regard either the morbific k Ve- nom, or the Nature and Motion of the Fluids upon which it operates: The morbifick Ve- nom, in Proportion to its Energy, and Dis- agreement
