.( 2S7 1 
fcrlbed by F/g, and is provided within with ftronor 
Sinewy Parts, to the end that when the Parts are e)£ 
tended by the Blood that is pour’d into them, tlrey may 
be able both in roundnefs and length to carry the Blood 
into the Arteries: thefe. Parts, by reafon of the great 
number of them, cannot be delineated in fuch manner as 
they ought. . - . . ^ . . 
Thele my new Pofitions will appear ilrange to a great 
many People, and I make no queftion, will meet with 
much Contradidion ; becaufe it has been the fix’d Hy- 
pothcfisof all the Learned Men, both paft and prefent, 
that have exercis’d themfelves in Anatomy, thaitthe Ar’ 
teiies receive fuch a Motion from the Heart, as we call 
the Pulfe: whereas I have now fhewn, that the Heart 
does protrude the Blood gently into the Arteries ; and^ 
that the Blood, which flows from the Veins into the 
Heart, caufes fuch a hidden fnatching or revulfion, that 
it can t fb immediately pafs thro the Valves* in which 
part alfo the^ Veins are a little narrower, by which ‘ 
means tliere is a kind of a flop or intermiflion in the 
Circulation of the Blood :* and this, f f^^yj is the Caufe 
of that Motion, which we call the Pulfe. 
