( 1974 ) ! 
Before ihefe Papers were fent to the Prefs, I had an' op- , 
portunit^ oi obferving a like Inftance of that firft menti- 
on'd in this latter part of thera.. It was an Elderly Gen- i 
tleipan^ about 72, who had fometinies Intermiffions in his 
Pulfe feveral years before his death, in whom I found di- 
vers Petrifications in the Mitral and Sctnilunary Valves of ' 
the Left Ventricle of the Heart, 
If ray time would give leave, I might here add fomc 
Anatomical remarks on the Stru&ure and Mechanifm of > 
this noble Organ, particularly of the life of that Tranf- 
verfe Tendon exprert at ff. Fig. i. and thetProgrers and 
Infertions of the Tendons f. Fig. 5, arifing from the C/r- 
Colnmn^ e e, which do not all terminate in the lower 
Margin of the Mitral Valve d. Fig. 2 and 5, but pafs to 
the upper and middle patifi?6f that Valve, whilft others ter- 
minate in the Bafis of the Heart,with the Mufcular ftrufture 
of the Semilunary Valves 3 but thefe I rauft referve for a- 
nother place. 
Hhi an at ion of the Figures, 
Fig. I. 
. The Left Ventricle of the Heart opened, &c. , 
AAA. The infide of the Aorta flit open to the Left Ven- : 
tricle. \ 
BB. The Bulbous Trunk of the Vena Pulmonalis divided 
through, and pinn-d afide to (hew 
a a a. The three Semilunary Valves of the Aorta^ whicfi \ 
hinder the Blood from returning to the Heart. 
b. A fmall Stony Body at the conjunftion of two of tfhe ■ 
Semilunary Valves, expreft at the *^ below this Figure; 
a a. Parts of the two Valves dryed. 
b. The Petrifaction, as it appears in the dryed Valves. /^;;; 
C Part of theiowcr Trunk of the Vena Cavay cut ofFidi^^ 
mediately above the Liver* - 
c c c. The Left Auricle open'dand pinii'd out. . 
D D. Th€i 
\ 
