tio 'A rruufe of B O D I E S. Chap, i r . 



5. In the third place , an enquiry occurreth emergent out of th< 



A enrols qae- <J-oftrmc, of the tawfc of bodies moving upwards and dowfl- 

 cidcd.' U ' wards. Which is, Whether there would be any naturall mo- 

 tion deep in the earth, beyond the activity of the funnes beams? 

 for ontof the.'e principles it followcth that there would not; 

 and consequently there mutt be a vaft orb in -which there \vojld 

 be no -morion of gravity or of levity: for fuppofe that the funne 

 beams might pierce a choufand miles deep into the body of the 

 earth ; yet there would ftill remain a malTe, whole diameter 

 xvould be near 5000 miles, in which there would be no ravi- 

 tatron nor the contrary motion. 



For my part 3 I fliall make no difficulty to grant the inference 

 as faiTG as concerneth motion caufed by our funnc: for 

 inconvenience would follow out of it ? Btit I will not offer 

 at determining whether there may not be eoclofed within that 

 great fphcre of earth, fome other fTrc, ( fudi as the ChymHIt 

 talk of) an Archeus, aDemogorgon Seated in the center, like 

 the heart in animals , which may raileup vapours and boyl an 

 aire out of them, and divide groffe bodies into ato*s; and ac- 

 cordingly give them motions anfwerable to ours, but in di(Fe 

 rent lines from ours, according as that fire or fiinne is fituated; 

 fince the farre-iearching Authour of the Dialogues de Mundo, 

 hath left that fpeculation undecided, after he had touched upoa 

 it in the twelfth knot of his firft Dialogue. 



Fourthly, it may be obje&cd, that if fudi defending atoma 

 cjT a$ wc navc dcfcribw! were the'caufe of a bodies gravity, and 

 why th c defcendiiig towards the center; the fame body would at direr* 

 bo- ri mes dcfccnd more and lefTe fwiftly ; for example, after mM- 

 dic$iscqua]iin night when the atomes begin to defcend more flovvly; then 

 htyof thc C ^. ua " likevvife the fame body would defccnd more flow ly in a like 

 tomes which proportion, and not weigh fo much as it did in the heat of thc 

 day. Thc fame may be faid of fummer'and winter : for in 

 winter time the atomes feem to be more gtofle ; and confc- 

 quently to ftrike more ftrongly upon thc bodies they meet 

 with in their way as they defcend : yet on thc other fide, 

 they feem in the funimer to be more numerous , as allb to 

 defcend from a greater height ; both which cireumftances will 

 be caufeof a ftronger ftroke and more vigorous impulfe up- 

 on the body they hit. And thc like may be objected of divers 



parts 



