of peflilenthl Difeajes. 4$ every Thing is rejefted, that cannot be anl- milated into homogeneous and like Proper- ties: The Matter of which Excretions is- likewife of fo fubtile and fermenting a Na- ture, that if introduced into the Fluids oi another well Perfon, it excites there the fame Motion and Diforden THIS Change of animal Subftances intd a Poifon, is too common a Truth to want any Atteftation to thofe who have been but indifferently converfant in Natural Enqui- ries. And it is greatly to our Purpofe, that even thofe Creatures, which are generally deemed poifonous, do require certain Degrees of Heat, and animal Action, to exalt their juices to fo high a Degree of Volatility^ as to put on the Properties of a Poifon, and aft as fuch upon other living Creatures ; in- fomuch that it is not only a common Obfer- vation that thefe Animals lofe their poifo- nous Nature when remov'd into Climes col- der than what is natural to them, but that alfo they are not fo venomous in their own Climates, at the cooler Seafons. of the Year 3 as in the moft fultry. BUT the Cafe of a mad Dog entirely comes up to that of a Contagion from a Fever. JD This
