ATrtMifeof BODIES. Chap, 



motion of the aircftrcngtH enough to force the 

 on wards, for ibine time afeer she fiift mover is fevered from it ; 

 (and long after, \oc let no rnotioas of this -nature do endure :) 

 ifo thai we need fcek no further can e for the continuance of ic : 

 but way reft fatisficd upon tSic whole matter, that finccd-iectu- 

 fniind ciTOMttftances ouvrcifon fuggtfterh unto us, are after 

 trcatme andparticuiar extrnrnatbn proportionable to the erTci&s 

 we ire, che doSh-inc we deliver waft fee found and trwe. 

 5. For theeftabitfhing whereof, \ve n^d not (considering what 



5Te firft v obj". wc ^ ave fci'c^y tftW) fpcnd much time io -folYing Galileos aiv 

 aion;:hac aire gumertts againtt it : feeing that,out of what we have letdown, 

 ewSPnSd. *^* a ^re to them appear plain enough^ for firft, vi^havt af- 

 o. And "how ^rrfrcd caofcs how the a ire may <x>ndnue its notion lcai enough 



violent morion . , . fc \s\\ \ 



to give asrtvuch impreflion as is weedrull unto the arrow, to 

 flvai^ it go on as it doth. Which motion is not reqtiifiteto be 

 neafr fe gfcat in the airc "behind the arrow ( ihatdriyech k on ) 

 31 s wkattlve arrow caufeth in the aifC before it : for by reafon of 

 thedcn^ty of it, it malt needs make \ greater impreffimi in 

 the a*e it cwttcih, then the aire that cauferfa its motion , 

 would do f it Keif without the mediation of die arrow. 

 As, when the force of a hand givcth motion unto a knife to 

 ut a loafe of bread, the knife, by reafon cxfthc dcnfity and 

 of the figure it hath, maketh a greater impteflion in rle ioaf, 

 then tl^c hand alone would do. And this is the (ante that we de- 

 clared in the natural motion of a hcavie thing downwards,cnto 

 which we affigned two caufes;nanicly,the beating of the atxwiaes 

 in the aire, falling do\tn in their naturall courfc, to dctcntiine 

 kthe way it is to go ; and the denfiry of the body, that cutting 

 more powerfully then thofe atomes can do ; gireth (^together 

 with their help) a greater velocity unto tbe moveable, then the 

 atomes of tlwm (elves can give. 



Nor doth it import that our refolution is agaiaft the geoe- 

 rall nature of rare and denfe bodies, in regard of conferring 

 motion; as Galileo objecleth : for the reafon why denfe bodies 

 do conferve motion longer then rare bodie$,is,becauie in regard 

 of their dividing virtue, they get in equal! times a greater velo- 

 city. Wherefore feeing that velociry is equal! unto gravity ; k 

 followeth,that refinance worked) not fo much upon them as up- 

 on rare bdies; and therefore cannot make them ccaic from noo- 



tion 



