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4 betray the very Spirits, to which they have so neer a cognation. Some Aers we know are held to be Alexipharmac and even deleterious to Poyson it self, as 'tis reported of that of Ireland: In some we finde Carcasses will hardly putrifie, in others again rot and fall to pieces immediately.

From these, or the like considerations therefore, it might well proceed, that Vitruvius, and the rest who follow that Master-Builder, mention it as a Principle, for the accomplishment of their Architect, that being skilfull in the Art of Physick, amongst other Observations, he sedulously examine the Aer and Situation of the places where he designs to build, the Inclinations of the Heavens, and the Climats; Sine his enim rationibus nulla salubris habitatio fieri potest: there is no dwelling can be safe or healthy without it. 'Tis true, he does likewise adde Water also, which is but a kinde of condensed Aer; though he might have observ'd, that Element to be seldome bad, where the other is good; omitting onely some peculiar Fountains and Mineral waters, which are percolated through Mines and Metalique Earths less frequent, and very rarely to be encounter'd.

Now whether those who were the Antient Founders of our goodly Metropolis, had considered these particulars (though long before Vitruvius) I can no waies doubt or make question of; since having respect to the nobleness of the situation of London, we shall every way finde it to have been consulted with all imaginable Advantages, not onely in relation to Profit, but to Health and Pleasure; and that, if there be any thing which seems to impeach the two last Transcendencies, it will be found to be but something Extrinsecal and Accidental onely, which naturally does not concern the Place at all; but, which may very easily be reformed, without any the least inconvenience, as in due time we shall come to demonstrate.

For first, the City of London is built upon a sweet and most agreeable Eminency of Ground, at the North-side of a goodly and well-condition'd River, towards which it hath an Aspect by a gentle and easie declivity, apt to be improv'd to all that may render her Palaces, Buildings, and Avenues usefull, gracefull and most magnificent: The Fumes which exhale from the Waters and lower Grounds lying South-ward, by which means they are perpetually attracted, carried off or dissipated by the Sun, as soon as they are born and ascend.

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