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 and a Contagion. 39 that not only Plants are produced and nou- rished by its fubtle and luxuriant Infinua- tion into their Fibres, but that alfo from the fame aerial Spirit the Life of Animals, and even the humane Species, is prefer ved a And I cannot fee any Difficulty in the Opinion, that the befl Temperature of the Blood and animal Juices, the Renewal of wafted Spirits, the Reftauration of Strength, and the good and healthful ConfKtution of the Vtfcera, Members, and whole Body, is maintained by the Ailiftance of this nitro- aerial Spirit. Nor does any thing appear more congruous to Reafon, than that from the fame Caufe does the Racy Spirit of the Blood arife ; and it is not derivable from any other ^ nor is it my fingle Opinion, that from the fame Principle -it derives its Colour:, but as there are no Arguments even objected to this Doctrine, it is need- lefs to imploy more Time in its Vindi- cation. BUT further, it may happen that this nitro-aerial Spirit may various Ways be changed in its Properties * 7 that is, either with Regard to its proliffick Influences, (if it may be fo expreffed) or, which much D 4 oftner