A Turgescency of bad Humours greatly facilitates the Plague’s Admission into any Person, whether such a morbid Constitution arises from the Suppression of usual Evacuations, or from an erroneous Use of the Non-naturals; and most of all, a Load of bad Humours from an Excess or a Surfeit, leaves so great a Similitude to the pestilential Poison, as greatly to encourage its Admission. But besides these Dispositions of the Subject, it is much to the Purpose to suggest this following Observation, that the Plague is sometimes so much hereditary, and influenced by a seminal Taint, that in a common Contagion it shall much exert it self in some in the same Manner upon Children, as their Parents, as in the _Small-Pox_, and other Affections of like Nature. _FOURTHLY_, It is necessary that there should be a continual Lodgment of the pestilential Poison; for if the noxious Steams were blown away as soon as received, there would be but little Mischief done; but those which meet with any glutinous Matter, and a certain _Lentor_ from the Viscidity of the Humours, with which they lie entangled, until they are carried through the larger Vessels with the Blood, begin to fuse and taint all the animal Juices; and thus the pestiferous _Miasmata_ having got Possession, are able to subvert the whole Machine, and bring all into Confusion, without requiring any long Stay to execute their pernicious Effects; for as soon as they once find a viscid and tenacious Substance, they eagerly join with it, and are but with great Difficulty to be extricated. Yet notwithstanding it is generally thus, I have sometimes found Instances of a longer Stay of the pestilential Poison before its Exertion, where the Symptoms of Infection have not appeared until a fit Time of Maturity for Eruption into Action, and for the Confirmation of which several Instances might be produced were it controverted; I have known many go into the Country after Intercourses with the infected, and keep well for a Month or two, when the Enemy that has lay hid so long, rushed out of its Fastnesses, and by its Fury sufficiently compensated its foregoing Delays; and this Eruption sooner might very probably have been hindred, partly by the Viscosity of the Humours entangling the pestilential _Miasmata_, and partly from an over-powerful balsamick Quality, natural to a good Blood, and to a Plenty and Vigour of animal Spirit; but as I would not be tedious upon Things so very obvious, this shall suffice concerning a Contagion.