Chap. ir. tsfTre.it/feofBODlES. JT5 



fheuld move doping, and not downward. Now that thefc <J cr <^'n; of 

 atomes dcfcend fomctimes flopingly.is evident, as when ( for in'ftrca. " 

 example) they meet with a dream of water, or with a (hong 

 wind, or even with any other little motion of the aire, fuch as 

 carryeth feathers up and down hither and thither j which muft 

 needs waft the atomes in fome meafurc along with them their 

 way ; feeing then that fueh a gentle motion of the aire is able 

 to put a feather out of its way, notwithstanding the pcrcuflions 

 of the atomes upon it ; why (hall it not Jikcwile put apiece of 

 iron out of its way downwards, fincc the iron hath nothing 

 from the atomes but a determination to its way ? But much 

 more, why fliould not a ftrong wind, or a current of water, do 

 it ; fincc the atomes them/elves that give the iron its determi- 

 nation muft needs be hurried along with them ? 



To this we anfvver, that we muft confider, how any wind 

 or water which runneth in that fort, is it (elf originally full of 

 fuch atomes ; which continually, and every where, prefie intoj 

 it and cut through it, in purfuing their conftant pcrpetuall 

 courfe of descending ; in fuch fort, as we (hewed in their run- 

 ning through any hard rock, or other denfcft body. And thcfc 

 atomes do make the wind or the water primarily tend down- 

 wards; though, other accidental! caufes impell them fecondari- 

 ly to a doping motion. And ftill, their primary naturall moti- 

 on will be in truth ftrongeft ; though their not having (cope 

 to obey that, but their having enough to obey the violent mo- 

 tion, makcth this become the more obfervable. Which appear- 

 eth evidently out of this ; that if there be a hole in the bottomc 

 of the pipe that conveyeth water flopingly, be the pipe never 

 fo long, and consequently the (loping motion never fb forcible ; 

 yet the water will run out at that hole to obey its more power- 

 full impulfe to the ccnterwards, rather then continue the vio- 

 lent motion, in which it had arrived to a great degree of celerity 

 Which being fo, it is eafie to conceive that the atomes in the 

 wind or water which move perpendicularly downwards, will 

 ftill continue the irons motion downwards, notwithstanding 

 the mediums Hoping motion rfincethe prevailing force tlcter- 

 mineth both the iron, and the medium downwards ; and the 

 iron hath a fuperproportion of denfity to cut its way, accor- 

 ding as the prevalent motion dccermincth it. 



H ^ But 



