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manner of Diseases having so universal a vehicle as is that of the Smoake, which perpetually invests this City: But this is also noted by the Learned Sir Kenelme Digby, Discourse of Sympathetick Powder.in confirmation of the Doctrine of Atomical Effluvia's and Emanations, wafted, mixed and communicated by the Aer, where he well observes, that from the Materials of our London Fires, there results a great quantity of volatile Salts, which being very sharp and dissipated by the Smoake; doth infect the Aer, and so incorporate with it, that, though the very Bodies of those corrosive particles escape our perception, yet we soon find their effects, by the destruction which they induce upon all things that they do but touch; spoyling, and destroying their beautiful colours, with their fuliginous qualities: Yea, though a Chamber be never so closely locked up, Men find at their return, all things that are in it, even covered with a black thin Soot, and all the rest of the Furniture as full of it, as if it were in the house of some Miller, or a Bakers Shop, where the Flower gets into their Cupboards, and Boxes, though never so close and accurately shut.

This Coale, says Sir K. flies abroad, fowling the Clothes that are expos'd a drying upon the Hedges; and in the Spring-time (as but now we mention'd) besoots all the Leaves, so as there is nothing free from its universal contamination, and it is for this, that the Bleachers about Harluem prohibit by an express Law (as I am told) the use of these Coles, for some Miles about that Town; and how curious the Diers and Weavers of Dammask, and other precious Silks are at Florence, of the least ingresse of any Smoaky vapour, whilst their Loomes are at work, I shall shew upon some other occasion: But in the mean time being thus incorporated with the very Aer, which ministers to the necessary respiration of our Lungs, the Inhabitants of London, and such as frequent it, find it in all their Expectorations; the Spittle, and other excrements which proceed from them, being for the most part of a blackish and fuliginous Colour: Besides this acrimonious Soot produces another sad effect, by rendring the people obnoxious to Inflammations, and comes (in time) to exulcerate the Lungs, which is a mischief so incurable, that it carries away multitudes by Languishing and deep Consumptions, as the Bills of Mortality do Weekly inform us. And these are those Endemii Morbi, vernaculous and proper to London. So corrosive is this Smoake about the City, that if one would hang up