7 $ A 'f rutty ^/BODIES. Chap. ?. 



dc.it tint of neceflity it miift-in a manner fill all places,3nd that 

 no feniib'e place is fo littkjbut that fire will be found in it,ifthe 

 medium be capacious. As aifo, that its extreme Icaft parts will 

 be very eafily fwallowed up in the parts of the aire, which'ftre 

 humide ; and by their enfolding, be as ic were quite loft; fo as 

 to lofe the appearance of fire. Aglin; tliat in ins refleftiont, it 

 Will follow the nature of grotfer bodies, and have glidings like 

 them; which is that, we call refractions. That litrle ftreamings 

 from it will crofle one another in exceflire great numbers, in an 

 unfcnfible part of fpace, without hindring one another. That 

 its rnotion will be quicker then fenfe can judge of; and there- 

 fore will fccm to move in an inftant, or to frand ifill as in a 

 ttrrgtration. That if there be any bodies fo porous witk lictle 

 and thick pores ; as that the pores arrive near unto equalling 

 the fubftance of the body ; then, fuch a body will be fo filled 

 with thefe little particles of fire , that ic will appear as if there 

 were no ftop in its paftage, but were all filled with fire; and 

 yet, many of thefe little parts will be refleded. And whatfo- 

 ever qualities elfe we find in light, \ve flvall be able to derive 

 them out of thefe principles, and flicw that fire muft of neceffi- 

 tie do \vhat experience teacheth us that light doth. That 

 is to fay in one word,it will fhew us that fire is light. But if fire 

 be lighten light muft needs be fire. And fo we leave this matter 



CHAP. IX. 

 Of Locall motion in common. 



i ryf Hough in the fifth chapter, we made onely earth the pre- 



tionean bepw- A tender in the controverfie againft fire for fuperiority in 



formed without a6livity; ( and in very truth, the greateft force of grarity doth 



ucccffion. appear in thofe bodies which are eminently earthy: _) neverthe* 



lefle , both water and aire (as appeareth out of the 4. chapter 



of the Elements ) do agree with earth in having gravity. And 



gravity, is the chief virtue to make them efficients. So that up* 



on the matter, this plea is common to all the three Elements. 



Wherefore , to explicate this virtue , whereby thefe three 



weighty Elements do work; let us call to mind what we faid in 



the beginning of the laft chapter concerning locall motion : to 



wit, that according as the body moved, orthc divider did more 



and more enter into the divided body ; fb, it did ;oyn it felf to 



