Chap. io. ^TrtAtifeof BODIES. 105 



the proportions 'between the gravity and the medium, may be 

 multiplied without end ; fo as, if he fuppofc that the gravity of 

 a body do make it go at a certain rate in imaginary fpace, 

 ( which is his manner of putting the force of gravity, ) then 

 there may be given ftich a proportion of a heavy body to the 

 medium, as itfliallgoin fuch a medium at the lame rate; and 

 ncvcrthclcfle, there will be an infinite difference, betwixt the 

 rcfiftance of the medium compared to that body, and the re- 

 fiftancc of the imaginary fpacc compared to that other body 

 which he fuppofeth to be moved in at the fame rate : which no 

 man will ftick at confeffing to be very abfurd. 



Then turning thcfcales, becaufe the refinance of the me*iiurn 

 doth fomcwhat hinder gravity, and that with leflfc refinance, 

 the heavy body moveth fafter ; it muft follow, that fince there 

 is no proportion, betwixt the medium and imaginary fpace; 

 there muft neither be any proportion betwixt the time in which 

 a heavy body fhall paffe through a certain quantity of the me- 

 dium, & the time in which it fhall paflc through as much imagi- 

 nary fpace:whercfbre,it muft pafle over fo much imaginary fpace 

 in an inftant. Which is the argument that Ariftotle is fo much 

 laughed at for prefling. And in a word^nothing is more evident, 

 then that ; for this effect which Galileo actributeth to gravity , it is 

 unreasonable to put adivifible quality, fince the effect is indivi- 

 fible. And therefore as evident it is that in his doArinc fuch equa- 

 lity ,as intrinfecal gravity is conceived to be.ought not to be put: 

 fince every power fhould befitted to the effect, or end for which 

 it is put. 



Another argument of Galileo is as bad as this; when he en- 

 deavoureth to prove that all bodies go of a like velocity, becaufe 

 ithappcncth that a lighter body in (omc ca{c,goeth fafier then a 

 Kenvier body in another cafe: as for example, in two pendants, 

 whereof the lighter is in the beginning of its motion, and the 

 heavier towards the end of it; or if the lighter hangcth at a lon- 

 ger firing, and the heavier at a fhorter; we fee that the lighter 

 will go fafter then the heavier. But this concludeth no more, 

 then if a man fliould prove that a lighter goeth fafter then a hea- 

 vier, becaufe a greater force qnn make it go faficr; for it is mani- 

 fcft that in a violent motion, the force which moveth a body in 

 the cn.l of its cour'ej is weaker then that which moveth it in the 

 : and the like is- ofthe two firings. But 



