( ij 5 ) 
That I might fatlsfy my felf in the abovemention- 
ed Obfervations, I have feveral times viewed that 
fort of Motion in my Arm, which we call the Pulfe, at 
the time when my Body was without motion and 
warm ; and after a diligent Confideration of it, I judg’d 
that that Motion, which we perceive in the Blood-Veifel, 
was not derived from the Heart to the Hand, but con- 
trariwife from the Hand to the Arm, and fo to the 
Heart : From whence I concluded, that like as in the 
Tail of an Eel there are no Valves in the Blood-VelTels, 
as far as I cou’d perceive, and that a great many fmall 
Blood- Veifels, are, as it were, united in that part where 
the Fifh-bones begin, and make one large Blood-Vef- 
fel, and that there is the firh Valve; in the fame man« 
nerin Humane Bodies, a great many fingle Blood-Vef- 
fels running out of the Hand, are joyned in the Arm, 
where likewife the firfl: Valve is, thro’ which the Blood 
at each Protrufion falls into the Heart, and that that is 
what we call the Pulfe. 
I have feveral times obferved in the exceeding fmall 
Veins or Capillary Veifels, a little lifmg or fwelling oc- 
cafion’d by a ftronger Motion of the Blood, whfch I 
now firmly conclude, to proceed only from the fudden 
Motion or running of the Blood thro’ the Valves : I 
have alfo obferved, that m fudden Frights, and other- 
wife, one feels fuch Motions at the end of one’s Fingers, 
juft as if there were Valves likewife in them, thro* 
which the Blood gufhes ; but thefe fort of Motions, I 
fuppofe, do only depend on that quick Motion made by 
the Blood, when it runs thro’ the Valve in the Arm by 
the Hand, to which we give the Name of a Pulie; 
’Tis faid, that there are Valves in all the Veins of 
one's Body; but I can hardly admit that Aifertion, for 
if there were Valves in thofe Veins, which we can fee 
with our naked Eye thro’ the Skin, forinflance, either 
of the Hand or the Arm, we fliou d certainly, in my 
' O 0 Opinion, 
