Chap. 2^. jTredtifeof BODIES. 



elfc would be empty , and co fupply the roomc* of thofe which 

 the heat continually fendech upwards : for the moyfture of 

 the root hath a continuity with that in the earth, and there- 

 fore, they adhere, together ( as in a pump, or rather as in fil- 

 tration ) and do follow one another when any of them are 

 in motion, and Ml the next murt needs come in, and fill the 

 roomc, where it findeth an empty fpace immediate to it. The 

 like of which happencth to the aire when we breathe : for 

 our lungs being like a bladder , when we open them, the aire 

 muft needs come in> to fill that capacity which elle would be 

 emptie : and when we (hut them again ; as in A pair of bellows 

 we put it put. 



This may fufficej concern ing the primary motion of roots: 

 but in that of the heart; we fhall find the matter not alcogether cess - 

 fo plain, Monfieur des Cartes following herein the ftcps of the nion touching 

 learned and ingenuous Do&our Harvey, who .hath invented Je heart," "^ 

 and teacheth that curious and excellent doctrine of the cir- 

 culation of the bloud; (as indeed, what fccret of nature can 

 be hidden from fb fharp a wit, when he applyeth himfelf to pe- 

 netrate into the bottome of it: ) expjjcateth the matter much 

 after this fort. That the heart, within, in the fubftance of it, is 

 like a hollow cavern; in whofc bottome, were an hot ftone; on 

 which fhould drop as much liquour as the fiery ftone could 

 blow into fmoke; and this fmoke or fteam fhould be more then 

 the cave could contain; wherefore it muft break out; which to 

 do, it preflcth on all fides to get an itfue or doore to let it out : 

 it findeth of two forts, but finely one kind of them will ferve it 

 for this purpofe ; for the one fort of the(e doores, opcneth in- 

 wards, the other outwards : which is the caufe that the more it 

 ftriveth to get out, the fafter it fliutteth the doores of the firft 

 Jcind ; but by the fame means, it beateth back the other doores, 

 and fo getteth out. 



Now when it is gone quite out of this cavern, and confe- 

 quently leaverh it to its naturall diipofition ; whereas before it 

 violently ftrctehed it out; and by doing fo kept dole the doores 

 that open inwards : then all the parts of it begin to flackcn; and 

 thofe doores give way unto new liquour to drop in anew ; 

 which the heat in the bottome of the heart; rarifiech again 



T 2 into 



