For although it be a more new and dif- 

 ficult way, to find out the nature of things, 

 by the things themfelves ; then by read- 

 ing of Books, to take our knowledge up- 

 on truft from the opinions of Philofo- 

 phers : yet muft it needs be confef- 

 fed, that the former is much more open, 

 and lefTe fraudulent, efpecially in the Se- 

 crets relating to I^atural Phiiqfophy, 



William Harvey, 

 Anatomical Exercitations, 1653. 



XV 



