'A Trutift of B O D I E S. Chap. io. 



in hot winds ( which the Spaniards call Eochornos from Boca 

 de homo by allufion to the breathing fleam of an oven -when 

 h is opened ) which do manifeftly fhew that the heat of the 

 funnels incorporated in the little bodies, which compote the 

 fteam of that wind. And by the principles we have already 

 layed, the fume would be evident ; though we had no experi- 

 ence to inftrudt usj for feeing that the body of fire is dry, the 

 wet parts (which are eafieft refolved by fire) muft needs 

 ftick unto them, and accompany them in their return from the 

 earth. 



Now whiles thefe afcend, the aire muft needs caufe others, 

 that are of a groffer complexion to dcfcend as faft, to make 

 the earth with room for the former, and to fill the places they left j that there 

 twTft!c?m S re ia niay be no vacuity in nature. And to find what parts they are 

 the afrej the anc j from whence they come, that fucceed in the room of light 



one afcendin." , , t - . , . 



rhe other de- and atornes glewed together that thus alcend ; we may take a 

 ijotifol^m'in ^ mt fr m tnc n wxime of the Opcicks, that light reflecting ma- 

 a perpendicular keth cquall angles; whence, fuppofing the fuperficies of the 

 line. earth to be circular, it w ? ill follow that a perpendicular to the 



center paiTeth juft in the middle between the tworayes; tn'e in- 

 cident and the refleSed. Wherefore the aire between thefe two 

 rayes, and fixh bodies as are in it being equally prcflcd on boch 

 fides; thofe bodies which are j'uft in the middle, are ncareft and 

 likelieft to fucceed immediately in the room of the light and 

 atomes which afcend from the fuperficies of the earth : and 

 their motion to that point is upon the perpendicular. Hence 

 it is evident > that the aire and all fuch. bodies as defcend 

 to fupply the place of light and atomes, which afcend from 

 the earth, do defcend perpendicularly towards the center of 

 the earth. 



And again, fuch bodies as by the force of light being cut 

 from the earth or water , do not afcend in form of light , 

 but do incorporate a hidden light and heat within them; 

 (and thereby are rarer then thefe defending bodies) muft 

 of neceffity be lifted up by the defcent of thofe denfer bodies that 

 go downwards, becaufe they ( by reafbn of their dcnfity ) are 

 moved with a 'greater force. And this lifting up muft be in a 

 perpendicular line; becaufe the others defcending on all fides 

 perpendicularly, mult needs raife thofe that are between them 



equally 



