The subtil medium prov'd; or, that wonderful power of nature ... conjectur'd by the most ancient and remarkable philosophers, which they call'd sometimes æther, but oftener elementary fire, verify'd. Shewing that all the distinguishing and essential qualities ascrib'd to æther ... are to be found in electrical fire ... Giving an account of the progress and several gradations of electricity. From those ancient times to the present ... / by R. Lovett.

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The subtil medium prov'd; or, that wonderful power of nature ... conjectur'd by the most ancient and remarkable philosophers, which they call'd sometimes æther, but oftener elementary fire, verify'd. Shewing that all the distinguishing and essential qualities ascrib'd to æther ... are to be found in electrical fire ... Giving an account of the progress and several gradations of electricity. From those ancient times to the present ... / by R. Lovett. Public Domain Mark. Source: Wellcome Collection.