FURTHERMORE, in this great Disorder of the Constitution, and inordinate Hurry and Colluctation of the Fluids, sometimes the Solids are maintained in their Contractions and Motions, until the Particles either introduced from Abroad, or generated in the Body, which cannot be assimulated into homogeneous Qualities, are thrown out of the Course of Circulation by the natural Discharges, by Transpiration, or by Abcesces; and the animal Fluids restored to their natural State. But when Matters are brought to this pass, it happens that the very Means of saving one Person, may prove the Destruction of many others; because what is thus critically thrown off by one, hath a Faculty of exciting the like Disorders in the Fluids of another, when it is insinuated into them; as a very small Quantity of some fermenting Substances will communicate its Efficacies a very great Way, and put very great Parcels of Fluid into the like Agitation. And this is the Way by which a malignant Fever comes to be infectious, and a _Pestilence_ changes into a _Contagion_; as _Bellini_ more largely explains it in his XXVIII_th Proposition_ of Fevers; from the whole of which it is manifest, as Dr. _Mead_ hath expressed it in his fifth _Essay of Poisons_, that _the Effects of the +one+ are the Cause and Beginning of the +other+_. TO bring then this nearer to the Matter under Examination, the Plague which is described in the foregoing Pages, was strictly and properly a _Contagion_, and by all Accounts of the best Authority, That which hath made such vast Devastations in some Parts of _France_, and now continues to rage amongst them, to the great Terror of their Neighbours, is also of the same Kind; and was brought to them in Merchandize, and by a Ship’s Crew, who were sick of a pestilential Disease all their Voyage Home from some Parts of _Turkey_; in neither of these there being any Manner of Fault chargeable upon the Air, or to any other Causes before enumerated in producing a _Pestilence_. THE Symptoms of That now Abroad are reported by the best Physicians amongst them to be _sudden Pains in the Head_, _great Loathing at Stomach_, _Reaching to Vomit_, _Consternation_, _wild Looks_, _trembling Voice_, _Coldness in the extreme Parts_, _low unequal Pulse_, _Paleness_, _Delirium_, _Convulsions_, _Carbuncles_, _Buboes_, _livid Vesications_, _purple Spots_, _and Hemorrhages_; _the last are certain Forerunners of Death_. All which, more or less, are the constant Attendants of all pestilential Fevers.