18 ®ft%t$n%mml®Mint 



fhorter Dimentions. But the Con- 

 je&ure it felf was much more eafie 

 to be made than the Experiment re* 

 quifite to examine it. For we found 

 it no eafie matter to fufpend an E- 

 lcdfricj great and vigorous enough, in 

 fuch a manner, that it might D whilft 

 fufpended , be excited , and be fo 

 nicely poifed^ that fo faint a force as 

 that wherewith it attra&s light bo- 

 dies fhould be able to procure a Lo- 

 cal Motion to the whole Body it felf. 

 But after feme fruitlefs attempts 

 with other Ele&ricks, I had recourfe 

 to the very vigorous piece of po- 

 lifh'd Amber y formerly mention'd, 

 and when we had with the help of a 

 little Wax fufpended it by a fiiken 

 thread, we chafed very well one of 

 the blunt edges of it upon a kind of 

 large Pin-cu(hion cover'd with a 

 coiirfe and black woollen ftuff, and 

 then brought the Ele&ric^ as foon as 

 we could y to fettle notwithftanding 

 its hanging freely at the bottom of 

 the ftring. This courfe of rubbing 

 on the edge of the Amber we pitch'd 



upon 



