For although it be a more new and diffi- 

 cult way, to iind out the nature of things, by 

 the things themfelves ; then by reading of 

 Books, to take our knowledge upon truft 

 from the opinions of Philof ophers : yet muft 

 it needs be confeffed, that the former is 

 much more open, and leffe fraudulent, efpe- 

 cially in the Secrets relating to Natural 



Philofophy. 



William Harvey, 

 Anatomical Exercitations, 1653. 



