t 4*8 1 
Jjtohr The fame niay be fa id, in fome meifure, of 
the Veins neareft the Heart, which may be plainly 
feen to dilate during the Contraction of the Auri- 
cles ; fo that the Heart, Auricles, and Veins, have 
all their Syftoles and < Diajloks in fubordinatc De- 
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Without fuch Receptacles as thefe it would be 
poffible for the Ventricles of the Heart to be fill'd 
from the Veins fo fuddenly as they are 3 for though 
the Areas of the tranfverfe Sections of the Veins 
are much larger than thofe of the Arteries, :yetKve 
find, by Dr. ‘Exp- et Merit 
that the Velocity $f the &0 qj& in the- . A&tfcries'fis* 
above jix lo-mpto that in^he Veins : But -finfce the 
Auricles keep ^pqeiving thq^leod whiiCthe Heart 
is in its ,; : (thq..Y.euis fdoingrihe fam^ by the 
Auricles) a due Quantity of Blood is always: ready, 
to be thrown into the Heart, by the Time it is fit 
to receive it ; for the E)ipfipde takes up two Thirds 
of the Space of Time between each Pulfe. 
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Here then we may obferve that the j Momentum 
of the refluent Blood acts upon, and diftends the 
Veins neareft the Heart, whilft the Auricles are con- 
tracted 5 that it alfo dilates the Auricles, whilft the 
Heart is in Action; and that the Heart is in its 
‘JDiajtole, whilft the Auricles ate in their Syftole. 
7 o ... But 
