long with them fuch light bodies as 

 they meet with in their way. On 

 occafion of which Hypothecs I (hall 

 offer it to be confider'd ^ Whether 

 by the gravity of the Atmofpheri- 

 cal Air > furmounting the Specifick 

 Gravity of the little and ranfid At- 

 tnofphere^made about the Amber by 

 its emiffions, and comprifing the 

 light Body faften'd on by them, the 

 Attraction may not in divers cafes be 

 either caufed or promoted. 



Another Hypothefis is that propo- 

 fed by that Ingenious Gentleman Sir 

 Kenelm Digby, and embraced by the 

 Very Learned Dr. Browne , ( who 

 feems to make our Gilbert himfelf to 

 have been of it ) and divers other 

 fagacious men. And according to 

 this Hypothefis % the Amber, or other 

 Ele&rick , being chafd or heated, 

 is made to emit certain Rayes or 

 Files of un&uous Steams r which ? 

 when they come to be a little coold 

 by the external air, are fomewhat 

 condens'd, and having loft of their 

 former agitation, (brink back to the 

 A 5 body 



