1. The first and moſt general Obſervation is, That Electrical Bodies draw not unless they be warm'd; which Rule though I have now and then found to admit of an Exception, (whereof I elſewhere offer an account,) yet, as to the generality of common Electricks, it holds well enough to give much countenance to our Doctrine, which teaches the effects of Electrical Bodies to be perform'd by Corporeal Emanations. For 'tis known, that Heat, by agitating the parts of a fit Body, ſolicites it as it were to ſend forth its Effluvia, as is obvious in odoriferous Gums and Perfumes, which, being heated, ſend forth their fragrant ſteams, both further and more copiouſly than otherwiſe they would.
2. Next, it has been obſerv'd, that Amber, &c. warm'd by the fire, does not attract ſo vigorouſly, as if it acquire an equal degree of heat by being chaf'd or rub'd: So that the modification of motion in the internal parts, and in the Emanations of
the
