Chap. 26. esfTwttfecf&ODlES. 15*9 



But if you defire to follow the bloud all along every ftep in 

 its progreffe from the heart round about the body, till it return 

 back again to its center, Do&our Harvey who mod acutely 

 teachech this dofhine, muft be your guide. He will {hew you 

 how it iflucth from the heart by the arteries, from whence it 

 gocth on warming the flcfli, untill it arrive to fome of the extre- 

 mities of the body : and by then it is grown fo cool ( by long 

 abfcnce from the fountain of its heat; and by evaporating its 

 own flock of fpirits, without any new fupply) that it hath need* 

 of being warmed anew; it fmdeth it felf returned back again to 



O O 



the heartland is there heated again, which return is made by the 

 veins , as its going forwards is performed oneiy by the arteries. 

 And were it not for this continuall circulation of the bloud, 

 and this new heating it in its proper caldron, the heart; it could 

 not be avoided but that the extreme parts of the body would 

 foon grow cold and die. For flefh being of .it felf of a cold na- 

 ture fas is apparent in dead flefli^) and being kept warm> merely 

 by the blond that bedeweth it; and the bloud likewile being of 

 a mture that foon groweth cold and congeaieth , unlefic it be 

 preferved in due temper by aclaall heat working upon it: how 

 can we imagine "that they two fingly, without any other aflj- 

 ftance; fhould keep one another warm fefpeci'ally in thofe parts 

 that are farre diftant from the heart ) by onely being together ? 

 Surely we muft allow the bloud., (which is a fubftance fit for 

 motion) to have recourfe back to the heart, ( where onely it 

 can befupplyed with new heat and fpirits _) and from thence be 

 driven out again by itpulfcs or ft rokes, which a re his fhmtings. 

 And as faft as it flicth out, (like a reeking thick fleam, which 

 rifeth from perfumed water falling upon a heated pan _) that 

 which is next before it muft flic yet further on, to maJvC way for 

 it; and new arteriall bloud ftill ifiu ing forth at every pulie, it 

 muft ftill drive on wh.it ifiued thence the laft precedent pulle, 

 and that part muft prtffe x>n what is next before it. And thus it 

 fareth with the whole mafic of bloud, which having no other 

 courfe but in the body, k muft at length run round, and by new 

 veflfcls ( which arc the veins ) return back unto the place from 

 whence it iffucd firft: and by that time it cometh thither, it is 

 grown cool and thick, andneedech a vigorous reftauration of 



fpirhs. 



