flDf t\)t ^ec&antcal 4D;tgtne 2 1 



thofe already mention'd, (as the ad- 

 vantage that Ele&rical Bodies ufual- 

 \y get by having well polifh'd or at 

 leaft fmoqth Surfaces ^) but the Ti- 

 tle of this Paper proxmfing fomeEjc- 

 perimentf about the Vrodnftion of E- 

 le&ricixy 5 1 muft not omit to recite^ 

 how I have been fometimes able to 

 produce or deftroy this Quality ia 

 certain bodies , by means of altera* 

 tiops, that appear 'd not to be other 

 than Mechanical* 



EXPER. I. 



ANd fir ft, having with a very mild 

 heat (lowly evaporated about a 

 fourth part of good Turpentine, I 

 found , that the remaining body 

 would not, when cold 5 continue a Li- 

 quor , but h^rden'd into a tranfpa- 

 rent Gumalmoft like Amber, which^ 

 as I look'd for 3 proved Ele&ricaL 



B4 EX^ 



