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10 quire to be as well wip'd as chaf'd; and even good ones will have their Operation promoted by the ame means. And this is very agreeable to our Doctrine, ince Terion, beides that it is, as I have ometimes manifetly known it, a kind or degree of Attrition, frees the Surface from thoe adherences that might choak the pores of the Amber, or at leat hinder the emanation of the teams to be o free and copious as otherwie it would be.

4. 'Tis likewie oberv'd, That whereas the Magnetical Steams are o ubtile, that they penetrate and perform their Operation through all kind of Mediums hitherto known to us; Electrical Steams are like thoe of ome odoriferous Bodies, eaily check'd in their progres, ince 'tis affirm'd by Learned Writers, who ay they peak upon particular Trial, that the interpoition of the finet Linnen or Sarnet is ufficient to hinder all the Operation of excited Amber upon a Straw or Feather placdplac'd [sic]