IT is said to be poisonous also, from its Similitude to the Nature of a Poison, and both being equally destructive to Life, and killing Persons much after the same Manner, so that they seem to differ in Degree only; for the deadly Quality of a Pestilence vastly exceeds either the arsenical Minerals, the most poisonous Animals or Insects, or the killing Vegetables; nay, the Pestilence seems to be a Composition of all the other Poisons together, as well as in its fatal Efficacies to excel them, for in this there is manifestly joined both the Height of Putrefaction and Malignity. And as in a great man the Virulence of this Taint hath been discoverable, so in one Youth for Instance it was so remarkable, that even in the Point of Death the whole Body changed green, which so alarmed the Mother, that she immediately hasted to my House, to know whether by Mistake there had not been some Poison given him; whereas he had taken nothing but mild and common Alexipharmicks; this green Hue therefore was a Demonstration of the poisonous Vitriolick Nature of the pestilential Taint. IT is said to be very subtile both on Account of its Original and Production, before it hath escaped from its native Seat; and that wonderful Comminution which it cannot but undergo in its Progress through so many Climates, whereby it is, as it were, sublimed to the highest Degree of Volatility, beyond that of any Meteor, which is the Production of gross, corporeal, and heterogeneous Particles; nay, it is more active than Lightning, and in the Twinkling of an Eye carries to a Distance Putrefaction, Mortification, and Death. AS for the Manner whereby it kills, its approaches are generally so secret, that Persons seized with it seem to be fallen into an Ambuscade, or a Snare, of which there was no Manner of Suspicion; they are therefore not to be credited or regarded, who affirm the Progress of a Pestilence to be sensible, even to the Smell and Sight, and report (though who will may believe them for me) the Infection to resemble the Fragrancy of Flowers in _May_, or any other sweet Savour; or, on the contrary, to strike the Nose like the Stench of a rotten Carcase; nay, some pretend to be so sharp-sighted, as to discern Clouds in the Atmosphere big with pestilential Poysons, and other such Conceits of a distempered Imagination, that are chiefly the Products of Fear, which construes every Thing for the worst: Although indeed I must confess, that sometimes this very subtile _Aura_ may be so mixed or loaded with gross and sulphureous Particles, as to be perceptible to the Senses.