‘AS this kind of Contagion then can easily proceed from an infected Person at a great Distance, as often as the noxious Particles can reach another Person, and give that Degree of Coagulation and Fusion, as is necessary to a _Pestilence_; the more aggravated then will be this Calamity, and more easily spread, when a healthful Person is near to one already infected; and yet much more worse, if it is in Contact with those Parts, which more plentifully, and with a greater _Impetus_, breath out infected Steams, as if the Air arising from the Mouth and Lungs, which must be extreamly hot, or the Perspiration of a Carbuncle when it is greatly inflamed; for in this Case the exhaling Particles will be in their greatest Activity when nearest the recipient Body, and likewise more dense, that is, more numerous, and consequently of greatest Efficacy. ‘BUT it is not every one that is seized with a _Pestilence_ from Contagion, by Means of Steams exhaling from any particular Parts of the Body; but only when these Steams, and the Air it self, hath joined with, and interspersed through it Particles of vitiated Faculties; and then this Kind of Fever will easily be communicated, and necessarily ensue, not only on Account of what gets into the Body with the inspired Air, but because also the whole Body is surrounded with such an Infection, wherein the noxious Particles floating about on all Sides, will endeavour to penetrate through the Pores upon the Surface, and get that Way into the Blood; for although the Skin is thicker upon the Surface of the Body, than that Pellicle covering the Vessels in the Lungs, and for that Reason it requires longer Time for such Particles to get that Way into the Blood, and the Habit of the Body, yet it is no Argument that they cannot get that Way at all, and be admitted into the Juices.’ BY this we are able to gather, that when a Fever from some Faults in the _Non-naturals_ comes to the highest Degree of Malignity, it makes such a Change in the animal Fluids as renders some Parts of them poisonous, and capable of exciting the like fermentative Motions, wheresoever they come into a proper Subject, without any of those procatarctic Causes as gave Rise to the Fever of the first Person seized.