r 14 ^h Art of Farriery 



Light a Light, or what I mean by Rays of Light, are no 



Flu''d ^oubt a fubtil Fluid that moves quick, and is conti- 



nually emitted from the Sun or Luminous Body. 

 Its Motion may be obferved by the Refleftion on 

 Solid Bodies, and the Refraftion it has in pafTing 

 through denfe Mediums, fuch as Glafs, &€. 

 Motion of I might here enter into a Philofophical Account 

 fvncker ^^ ^g^^» ^^^ ^^w how much quicker its Motion is 

 than that ^^^^ ^^^^ °^ Sounds, which is the fecond in quick- 

 of Sounds, nefs to Light; and that this Body, for fuch it is, 

 though of extremely fmall Particles, according to 

 In what the DemonHration of Mr. Rome?; from the Eclipfes 

 Space of of Jupiter s Satellites y finifhes its Progrefs from the 

 T}^ r. Sun to this Earth, in about ten Minutes of Time; 

 ni'^es its ^^^ moves a Million of Times quicker than a Can- 

 Courfe, non-bullet, Ihot from the Mouth of a Cannon. For, 

 from the as the firfl comes to us from the Sun in ten Minutes, 

 Sun to the latter would be 2 5 Years in hnifhing the fame 

 this Earth. Courfe, though it fhould fly with the fame Celerity 

 as at firft ; and yet the Sound of the fame Cannon, 

 would be here in a little more than half that Space 

 of Time, And the Reafon why a Bird does not fly 

 away,, and efcape being killed by the Fowler, when 

 Jjght and Sound are fo much quicker than the Ball 

 or Hail-ftiot, is, becaufe the Diftance between the 

 Fowler and the Bird is fo fmall, that the Difference 

 is fcarcely diftinguiihable, except by a Perfon who 

 is a good Judge of thefe Things ; for the Motion of 

 all the Three is exceeding quick, 

 •^hat -A^^ Bodies abounding with earthy Particles, and 



Bodies by efpecially if they are fulphureous, and their Parts 

 Agitation fufficiently agitated, do emit Light, whatfoever way 

 enutLighc. ^^^^i Agitation is brought about. Thus Sea- Water 

 ftiines in a Storm ; Quickfilver when fliaked in 

 Vacuo ; Cats or Horfes when rubbed in the Dark ;. 

 and Wood, Fifh, or Flefh, when putrefied. 

 Light, Light then is that Materia Suhtilis, fent forth 



what it is. from the Sun or Luminous Body in Lines or Rays, 

 commonly called Sun-beams ; and thefe coming with 

 fuch incredible Swiftnefs, and meciing the Eye, 



properly 



