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Rh perturb'd, and concern'd, when the Lungs are prepossessed with these grosse and dense vapours, brought along in the Aer; which on the other side being pure and fitly qualified, and so conducted to them, is there commixed with the circulating blood, insinuating it self into the left ventricle of the heart by the Arteria Venosa, to rarifie and subtilize that precious vehicle of the Spirits and vital flame: The Vena Arteriosa, and Arteria Venosa disposing themselves into many branches through the Pulmonique lobes, for its Convoy the Aer (as we sayd) being first brought into them out of the Bronchia (together with the returning blood) to the very Heart it self; so as we are not at all to wonder, at the suddain and prodigious Effects of a poysonous or lesse wholesome Aer, when it comes to invade such noble Parts, Vessells, Spirits and Humours, as it visits and attaques, through those subtile and curious passages. But this is not all.

What if there appear to be an Arsenical vapour, as well as Sulphur, breathing sometimes from this intemperate use of Sea-Cole, in great Cities? That there is, what does plainly stupifie, is evident to those who sit long by it; and that which fortun'd to the Dutchmen who Winter'd in Nova Zembla, was by all Physicians attributed to such a deleterious quality in the like fuell, as well as to the Inspissation of the Aer, which they thought only to have attemper'd, as is by most esteem'd to be the reason of the same dangerous halitus of Char-Cole, not fully enkendl'd. But to come neerer yet.

New Castle Cole, as an expert Physician affirms, causeth Consumptions, Phthisicks, and the Indisposition of the Lungs, not only by the suffocating aboundance of Smoake; but also by its Virulency: For all subterrany Fuell hath a kind of virulent or Arsenical vapour rising from it; which, as it speedily destroys those who dig it in the Mines; so does it by little and little, those who use it here above them: Therefore those Diseases (saith this Doctor) most afflict about London, where the very Iron is sooner consum'd by the Smoake thereof, then where this Fire is not used.

And, if indeed there be such a Venemous quality latent, and sometimes breathing from this Fuell, we are lesse to trouble our selves for the finding out of the Cause of those Pestilential and Epidemical Sicknesses (Epidemiorum Causa enim in Aere, says Galen) which at divers periods, have so terribly infested and wasted us: or, that it should be so susceptible of infection, all Rh