polifhMV which feeming to contradict 

 what has been obferved by others and by 

 usalfo, that Amber, for inftance, attrads 

 more vigoroufly if the furface be made ve- 

 ry fmooth than otherwife, it induces me 

 to conje&ure, that, if this Obfervation a- 

 bout Diamonds be true, as fome of my 

 trials have now and then inclined mc to 

 think it, and if it do not in fome cafes 

 considerably depend upon the lofs of the 

 (Ele&rical) Subliance of the St )ne> by its 

 being cut and ground, the Reafon may 

 poflibly be, that the great rapid nefs with 

 which the Wheels that ferve to cut and 

 pohfh Diamonds muft be mov'd, does ex- 

 cite a great degree of heat, ( which the 

 fenfes may eafily difcovcr) in the $tone f 

 and by that and the ftrong concuffion it 

 makes of its parts, may force it to fpend 

 its effluviable matter, if I may fo call it, 

 fo plentifully, that the Stone may be im- 

 poverifliM, and perhaps alfo, on the ac- 

 count of fome tittle change in its Texture* 

 be rendred lefle difpofed to emit thofe 

 effluvia that are Inftruments of Electrical 

 Attra&ion. But as I willingly leave the 

 matter of Faft to further Trial, fo I do 

 the Caufe of it, in cafe it prove true, to 

 farther Inquiry. 



FINIS. 



