( '9^^ > 
Upon opening the C hcft, the Heart, parfirulirff ns 
Left Ventricle, was kravid larger ihuithat ut an n^uu f 
Ox, 'nd fiUd vith voaguistcd Blood. The Valt ts of 
the Gftat Artery A A. Fig. i. were Pernfy'd^ infornuch 
that they could nut approach each other, as exprcll f ig 2« 
and 4 But an Orifice, rcprefented at Fig, 5, remained 
alw^iys open by the Petribdions b b. Fig. 3. and aa» 
Fig, 5, which had cloggd thefe Valves, and hindered 
their application to each other, as in a Natural fta.e is 
rcprefented in Fig. 2 and 4, a a a. 
T he explication of the Symptoms in both thefe Cafes is 
obvioas enough 5 for tho the Perfon firft inftanced did 
not dye of the fame difeafe with thelaftmentioned,yetth€ 
Symptoms in his Illnefs plainly (hewed what muft follow^ 
from the diforders of thefe Falms, as they are rcndred 
more or lefs ufelefs : For as their Office is to prevent the 
return of the Blood into the Heart, in its Dhjiotey by ex* 
a£Hy fhutting up the paiTage of the Aorta (as the Flaps 
in Watpr Engines) fo if by any accident they are hinder'd 
from ^oing their duty, as they were by the Petrifadions 
mentioned, the confequences muft be, not only a regur* 
gitation of Blood into the Heart, but they baulk its impul- 
five force, when the Mnfcular Fibres (which are in thefc 
Valves) cannot contraft to prepare the pafTage for the 
Blood ol the Left Ventricle^ when to be expelled into the 
Aorta. Hence the Intermiffions of the Pulfe in the firft 
inftance may be accounted for. In the latter inftance^ 
thefe Valves were wholly ufelef», the Circulation be- 
came more difficult, as appeared by the refrig**ration of 
the extreme parts, Gangreens, d^c. In both thefe cafes 
die Le^t Venticle of the Heart was dilated proportiona- 
bly to the ill conftitution of thefe Valves, which dearly 
Ihews tht ft Valves give that affiltance to the Heart in its 
Office ih t ir cannot be without, and that it gradu^ily 
fuifeu according to their itidiipoiitioa. 
