Page:Experimentsnotes00boyl.pdf/562

8 1. The first and mot general Obervation 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 elewhere 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, olicites it as it were to end forth its Effluvia, as is obvious in odoriferous Gums and Perfumes, which, being heated, end forth their fragrant teams, both further and more copiouly than otherwie they would.

2. Next, it has been oberv'd, that Amber, &c. warm'd by the fire, does not attract o vigorouly, 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