We are therefore to take Notice, that when a _Fever_ is communicated by way of _Infection_ from one already Diseased, this most commonly happens in the latter End of the Distemper, that is, (as we before discoursed concerning the Hydrophobia) when the Fermenting Blood is throwing off great quantities of its Active Fermentative Particles upon the Glands of the most constant and easie Secretion; such are those in the Surface of the Body, and the Mouth and Stomach; By this means therefore the Liquid of insensible Perspiration, and the Sweat is impregnated with these μιάσματα, and thus the ambient Air becomes fill’d with ’em; so that not only, (as _Bellini_ Argues (173),) may some of these _Effluvia_ insinuate themselves into the Blood of a sound Person thro’ the Pores of the outward Skin, but also in Inspiration thro’ the Membrane of the Lungs; for He has in another Place (174) demonstrated how the Air, or something from It, may this way come to be mix’d with the Arterial Fluid; And thus the like _Ferment_ will be rais’d Here, as was in the Originally Distemper’d Subject. This may be _One_, but there is perhaps _another_ yet more dangerous manner of _Infection_, and that is, by the Breath of the Diseased taken in by a By-stander, especially in the last Moments, seizing the _Stomach_, and fixing a _Malignity_ There. For it is upon this Score, that Those who are _Infected_ do presently complain of an extreme Pain and _Nausea_ in the upper Orifice of the Stomach; and that all Authors do agree in the admirable Use of _Vomits_ timely given in this Case; These by their Stimulating Force removing the very _Minera_ of the Disease; and likewise that, oftentimes in _Pestilential_ Illnesses, the _Stomach_ when open’d has been found Gangren’d and Mortify’d. This made _Van Helmont_ (175), who had observ’d this Part in one kill’d by a _Plague Infection_, perforated and eroded in several Places, no otherwise than He had seen in one Poison’d by _Arsenick_, conclude, that the Plague for the most Part begins in the Stomach from a coagulated _Tartar_ there. Herein lies the difference of _Contagion_, from the first Invasion of Malignant Distempers; The Effects of the _One_ are the Cause and Beginning of the _Other_; and therefore it is no wonder, if tho’ the Symptoms in the former are by a gradual Increase wrought up to their height, they do however in the latter, even at the very first, discover their ill Nature and Violence, and, like a reinforc’d Enemy, by surer Strokes make quicker Dispatch. And this also is the Reason of the great Increase of _Funerals_ in Plague Time, in that One Death is thus added to Another.