at €httxhitj}. $ 



the Ambevmay 5 as well as the de- 

 gree of it> contribute to the Attracti- 

 on. And my particular Obfervati- 

 ons incline me to adde, that the ef- 

 fect may oftentimes be much pro- 

 moted y by employing both thefe 

 ways fucceffivelyf as I thought I ma- 

 nifeftly found when I firft warm'd 

 the Amber at the fire y and preferu- 

 ly after chaf'd it a little upon a piece 

 of cloth. For then a very few rub- 

 bings foem'd to excite it more than 

 many more would otherwife have 

 done : As if the heat of the fire 

 had put the parts into a general, but 

 confus'd, agitation $ to which 'twas 

 eafie for the fubfequent Attrition 

 Cor Reciprocation of PrefTure) to 

 give a convenient modification in a 

 Body whofe Texture difpofes it to 

 become vigoroufly Ele&rical. 



3. Another Obfervation that is 

 made about thefe Bodies, \s 9 That 

 they require Terfion as w 7 ell as At- 

 trition } and though I doubt whether 

 the Rule be infallible 5 yet I deny- 

 not but that weaker Ele&ricks re* 



quire 



