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38 polifh'd; which eeming to contradict what has been oberved by others and by us alo, that Amber, for intance, attracts more vigorouly if the urface be made very mooth than otherwie, it induces me to conjecture, that, if this Obervation about Diamonds be true, as ome of my trials have now and then inclined me to think it, and if it do not in ome caes coniderably depend upon the loss of the (Electrical) Subtance of the Stone, by its being cut and ground, the Reaon may poibly be, that the great rapidnes with which the Wheels that erve to cut and polith Diamonds mut be mov'd, does excite a great degree of heat, (which the enes may easily dicover) in the Stone, and by that and the trong concuion it makes of its parts, may force it to pend. its effluviable matter, if I may o call it, o plentifully, that the Stone may be impoverih'd, and perhaps alo, on the account of ome little change in its Texture, be rendred lee dipoed to emit thoe effluvia that are Intruments of Electrical Attraction. But as I willingly leave the matter of Fact to further Trial, o I do the Caue of it, in cae it prove true, to farther Inquiry.