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TO try how far the Account given of the Attraction of a Load-Stone, depended on what some Modern Philosophers teach, viz. That the Effluvia of a Load-Stone pressing away the Air betwixt the Body attracted, that Air helps the Attraction, by pressing against the op∣site
side of the Stone; We plac'd a vigorous Load-Stone in our Receiver, having adapted a Cap of Steel to it, to the lower side of which, a Scale with 6 Ounces of Troy Weight was fix'd, which being all the Load-Stone, besides the Steel and the Scale was able to keep up (all which be∣ing suspended at a Button, which was on purpose on the inside of the Cover of the Receiver) we observ'd, that tho' the Receiver was exhausted as much again as in common Experiments; yet, the Load-Stone sustain'd it's Weight almost as firmly as before the Pump was ply'd; and the Reason why it was not altogether, was, the thinness of the Medium; since the Weight sus∣pended must be heavier, when the Air which was nearer proportion'd to their Weight was exhausted.