3 1 8 Mif : el lane a Curio fa I 



Now this iiearnefs or farnefs may be eftimated 

 by the Difta nee of Time between feeing the 

 Flafh of Lightning, and hearing the Noife of 

 the Thunder. For though in their Genera- 

 tion, they be iimultaneous ; yet (Light mov- 

 ing fafter than Sound) they come to us fuo 

 ceftively. I have obferv'd that, commonly, 

 the Noife is about Seven or Ei^ht Seconds 

 after the Flalli (that is, about half a quarter 

 of a Minute) ; but fometimes much fooner, in 

 & Second or Two, or lefs than fo, and almoft 

 immediately upon the Flam. And at fuch 

 time, the Explofion mull needs be very near 

 us, or even amongft us. And, in fuch Cafes, 

 1 have, (more than once) prefaged the Ex- 

 pectation of Mifchief, and it hath proved ac- 

 cordingly, in the Deftru&ion of Men or Cat- 

 tel, and the like. (As once at Oxford ; when, 

 within half an Flour after fuch Prefage, I 

 heard of one killed at Medly, hard by, and 

 others endangered } and another time at Tow- 

 ceflcr, when within a few Hours after, we 

 Iieard of Five Perfons kilfd at Evert on, about 

 Four or Five Miles from us, and others 

 wounded} befide other Hurt done.) 



Now, that there is in Lightning a Sulphor- 

 ous Vapour, is manifeft from the Sulphoroms 

 Smell which attends it, efpecially when Hurt 

 is done:, and even where no Hurt is done, 

 from the Lightning it felf,more or lefsdifcern- 

 able. And a fultry Heat in the Air, is com- 

 monly a Fore-runner of Lightning foon after. 



And that there is alfo a Nitrous Vapour 

 with it, we may reafonably judge, becaufe we 

 do not know of any Body fo liable to a fud- 

 dain and violent Explofion. 



Now 



