Abstract
IN introducing the discussion on Mr. Spottiswoode and Mr. Moulton's paper on the “Sensitive State of Vacuum Discharges,” at the meeting of the Royal Society on April 15, Dr. De La Rue, who occupied the chair, good-naturedly challenged me to substantiate my statement that there is such a thing as a fourth or ultra-gaseous state of matter.
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A Fourth State of Matter 1 . Nature 22, 153–154 (1880). https://doi.org/10.1038/022153a0
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DOI: https://doi.org/10.1038/022153a0