PHYSICAL AND LITERARY. 125 



that thefe bodies move themfelves ? The 

 contrary of this appears in fo many in- 

 ftances, as gives good reafon to believe 

 it never happens in any cafe. We fee for 

 certain miany motions begun by anima- 

 ted beings ; we obferve many bodies mo- 

 ved by the impulfe of other bodies ; and 

 the mechanical caufes of fome motions, 

 have through time been difcovered, 

 which were not formerly perceived. 

 Once in a day, it was found philofophy to 

 maintain that fmoak and vapour mounted 

 upwards of themfelves by a principle of 

 levity, though now one might as well af- 

 fert that cork rifes up of itfelf in water. 

 Many phsenomena were explained from 

 ^n abhorrence of a void, which was fully 

 as reafonable a paflion in a dead body 

 as the love of a center, or an inclination 

 to meet with other bodies. The rife of 

 water in punaps was afcribed to a felf- 

 moving power in the water, and the pul- 

 iation of the arteries to a power they had 

 of dilating themfelves. The power of 

 Riagnetifm bears fome refemblance to that 

 of gravity j the theory of it is ftill imper- 



fea: 



