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 of peftilential VifeajZL y of it ) and in feverai Places (a) he difcovers his Opinion, that Peftilential Difcafcs have their Rile from hence. Galen, his bell: In- terpreter, underflood his to $£:v, which fome will have to be meant of ibmewhat Divine, or the immediate PI and of God, to be nothing elfe but a particular Confuta- tion of Air ariiing from natural Caufes ^ and that he was of the fame Mind himfelf^ is very plain from his own Writings (£)< IT is almoft endlefs, as well as altogether needlefs, to cite all the Authorities for this Opinion, that might be collected from the moft remote Antiquity down to the pre- lent Age. We Avail therefore proceed to consider the different Conflitutioas of Air, according to the forementioned Diftin£Hon - 7 premifing only, that' the Terms Hot, Cold, &c* are ufed in a twofold Senfe, the one is Ab- solute, and the other Relative ; by the former, viz.. Ahfolnte Heat, Cold, &c. is underflood one fimple Property of the Air only, as it is different not in Degree, but in Quality from others : By the latter, that is Relative Heat 7 &c. is meant certain Degrees of thole B Pro- (a) VU. Epidem, And de Acre, Aquis & Loci? {b) Vid. Comment; in£pidem< Hi^wYAtzu