Chap. 10. 4 Trtanfe of BO DI E S. 10 



the difference of the fcruple will be very notable. So then, 

 thole bodies, whofe difference of defending in water is very 

 fenfible ( bccaufeof the greater proportion of weight in water, 

 to the bodies thatdefcend in it ) will yield no fenfiblc difference 

 of velocity when they dcfcend in airc, by reafon of the great dil- 

 proportion of weight between aire & the bodies that defcend in it 



The rcafon of this will clearly (hew it fcif in abftra&ed pro- 

 portions. Thus; fuppofe airc to hare one degree of denfity, and 

 water to have 400 ; then let the moveable A have 410 degrees 

 of denfity ; and the moveable B have 500. Now compare 

 their motion to one another in the Icverall mediums of airc and 

 water. The exuperance of the denfity of A to water is 10 de- 

 grees, but the exuperance of B unto the fame water, is 100 de- 

 grees; {b that B muft move in water fwifter then A, in the pro- 

 portion of 100 totcnne; that is, of 10 to one. Then Ictus 

 compare the exuperance of the two moveablej over aire. A is 

 409 times more denie then aire ; but B is 499 times more denfe 

 then it. By which account, the motion of B, muft be in that 

 mcdiam fwifter then the motion of A, in the proportion of 499 

 to 409 : that is, about 50, to 41 : which ( to avoid fractions ) 

 we may account as 10 to 8. But in water they exceed one an- 

 other as 10 to one: io that their difference of velocity, muft 

 be fcarce perceptible in aire in refpccl: of what it is in water. 



Out of all which di/courfe, I onely inftrre in common, that 

 a greater velocity in motion, will follow the greater denfity of 

 the moveable; wuhout determining here their proportions: 

 which I leave unto them, who make that examination their 

 task : for thus much fcrveth my prefent turn : wherein I take 

 ft fiirvey of nature, but in groflc. And my chief drift in this par- 

 ticular is onely to open the way for the difcovering how bo- 

 dies lhat of thcrnlelves have no propenfion unto any determi- 

 nate place; do ncverthclefle move conftantly and perpetually 

 one way; the denfe ones defcending, and the rare ones afcend^ 

 ing : not by any intrinfccall quality that worketh upon them; 

 but by the oeconomy of nature, that hath let on foot due and 

 plain caufcs to produce known effeffo. 



Here we muft crave patience of the great foul of Galileus 9' 

 (whole admirable learning all pofterity muft reverence) whiles gr^jt^doth 

 we reprehend in him , that which we cannot term leflethen produce a fwif 



^ . cr or a flower 



