the defcending 

 dy. 



^4 curious qttcftion left un- 

 decided. 



The fourth objection anfwered, 

 why the defcent of the fame 

 heavy bodies, is equall in fo 



inequality of the at owes 



r 

 catije it. 



5. The reafon why thefhelter of a 

 thick, body doth not hinder the 

 descent of that which is un- 

 der it. 



$. The reafon why fame bodies 

 finkj others fwimme. 



7. The* fifth objection anfwered 

 concerning the descending of 

 heavy bodies tn flreams. 



8. The fixth objection finger- 



ed ; and that all heavy ele- 

 ments do weigh in thetr owne 

 fphcres. 



p. The feventh objettion anfwer- 

 ed, and the reafon why we do 

 not feel the courfe of the aire, 

 and atomes that beat continu- 

 ally upoa tu. 



10. How in the fame body, gravi- 

 ty may be greater then denftty, 

 and denjtty then gravity 

 though they be the fame 

 thing. 



11. The opinion of gravities be- 

 ing an intrittfecall inclination 

 of a btdy to the center , refuted 

 by reafon. 



I j. The fame opinion refuttd by 

 feverall expediences. 



A Table. 



denfe bo- CHAP. XII. 



Of violent Motion, 



The flat e of the ejue/lion touch- 

 ing the caufe of violent mo- 

 tion. 



That the medium is the onely 

 caufe, which continueth vio- 

 lent motion. 



9^4 further explication of the 

 former doctrine. 

 That the aire hath Jlrength 

 enough to continue vtolent mo- 

 tion in a moveable. 

 An anfwer to the first objecti- 

 on ; that aire is not apt to con- 

 ferve motion ; and how vi- 

 olent motion cometh to 

 cetfe. 



6. -An anfwer to the fecond obje- 

 Elton y that the aire hath no 

 power over heavy bodies. 



7. An anfwer to the third obje- 

 ction, that an arrow foould fly 

 fafl-er broad wayes then long 

 wayes. 



CHAP. XIII. 



Of three forts of violent motion, 

 Reflexion, Undulation, and Re- 

 fraction. 



I. That reflexion 



f 



violent motion. 



Reflection is made at tqualt 

 angles. 



7 he caufes and properties of 

 undulation. 



