LETTERS. 613 



for the transmission of all the supplies required by the body. 

 And I have asked myself farther, why such numbers of blood- 

 vessels, arteries, and veins should be sent to the intestines if 

 there were nothing to be brought back from thence ? especially 

 as these are mere membraneous parts, and on this account re- 

 quire a smaller supply of blood. 



These and other observations of the same tenor I have 

 already made, not as being obstinately wedded to my own 

 opinion, but that I might find out what could reasonably be 

 urged to the contrary by the advocates of the new views. 

 I am ready to award the highest praise to Pecquet and others 

 for their singular industry in searching out the truth ; nor do 

 I doubt but that many things still lie hidden in Democritus's 

 well that are destined to be drawn up into the light by the 

 indefatigable diligence of coming ages. So much do I say at 

 this time, which, I trust, with your known kindness, you 

 will take in good part. Farewell, learned friend ; live 

 happily, and hold me always 



Yours, most affectionately, 



WILLIAM HARVEY. 



London, 1st February, 1654-5. 



LETTER VII. 



To the distinguished and learned John Dan. Horst, principal 

 Physician at the Court of Hesse-Darmstadt. 



MOST EXCELLENT SIR, Advanced age, which unfits us for 

 the investigation of novel subtleties, and the mind which 

 inclines to repose after the fatigues of lengthened labours, 

 prevent me from mixing myself up with the investigation of 

 these new and difficult questions : so far am I from court- 

 ing the office of umpire in this dispute ! I was anxious to 

 do you a pleasure lately, when, in reply to your request, I 

 sent you the substance of what I had formerly written to a 

 Parisian physician as my ideas on the lacteal veins and 



