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Rh the Amber, may, as well as the degree of it, contribute to the Attraction. And my particular Obervations incline me to adde, that the effect may oftentimes be much promoted, by employing both thee ways ucceively; as I thought I manifetly found when I firt warm'd the Amber at the fire, and preently after chaf'd it a little upon a piece of cloth. For then a very few rubbings eem'd to excite it more than many more would otherwie have done: As if the heat of the fire had put the parts into a general, but confus'd, agitation; to which 'twas eaie for the ubequent Attrition (or Reciprocation of Preure) to give a convenient modification in a Body whoe Texture dipoes it to become vigorouly Electrical.

3. Another Obervation that is made about thee Bodies, is, That they require Terion as well as Attrition; and though I doubt whether the Rule be infallible, yet I deny not but that weaker Electricks re- quire