4 To Prince Charles 



to compare small things with great. Here, at all 

 events, best of Princes, placed as you are on the 

 pinnacle of human affairs, you may at once con- 

 template the prime mover in the body of man, and 

 the emblem of your own sovereign power. Accept 

 therefore, with your wonted clemency, I most humbly 

 beseech you, illustrious Prince, this, my new Treatise 

 on the Heart ; you, who are yourself the new light 

 of this age, and indeed its very heart ; a Prince 

 abounding in virtue and in grace, and to whom we 

 gladly refer all the blessings which England enjoys, 

 the pleasure we have in our lives. 



Your Majesty's most devoted servant, 



WILLIAM HARVEY. 

 LONDON, 1628. 



