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30 for Electrical Experiments, I afterwards repeated the Trial, and found, that in warm Weather it would retain a manifet power of attracting for everal minutes (for it tirred a pois'd Needle after above of an hour) after we had done rubbing it. Upon which encouragement we upended it, being first well chafed, in a Glas Receiver that was not great, jut over a light Body and making hate with our Air Pump to exhaut the Glas, when the Air was withdrawn, we did by a Contrivance let down the upended Amber till it came very near the Straw or Feather, and perceived, as we expected, that in ome Trials, upon the leat Contact it would lift it up, and in others, for we repeated the Experiment, the Amber would raie it without touching it, that is, would attract it.

You will probably be the les dipos'd to believe, That Electrical Attractions mut proceed from the Subtantial Forms of the Attrahents, or romfrom [sic] the Predominancy of this or that Chymical Principle in them, if I acquaint you with ome odd Trials wherein the Attraction of light Bo- dies