[ < 8 * ] 
i. Of the Foramen ovale open in the Adult, and of it* 
HIS laft Winter I opened a great Number of 
dead Bodies of Men grown, and did not find 
the Foramen ovale open in any of them. 
The oldeft of the Male Subjects, in which I found 
it open, was a Lad of 15 Years of Age. 
Of 20 Bodies of Women, which I examined, in 
Seven I found the Foramen ovale open. 
Among the Number of Openings that remain of 
this Foramen, there is a great Variety in their Shape, 
and in that of the Cicatrices or Adherences of the 
Valve: However, they may conveniently be reduced 
to Three Sorts, expreffed in the Figures hereto an- 
nexed, fee Tab. II. 
The Firfl: and Second Figure reprefent the Firft 
Sort of Foramen ovale, that remains open in the 
The Third and Fourth Figures reprefent the Second 
Sort j and Fig. 5 and < 5 . the Third. 
Explanation of the Figures. 
Fig. 1. The Foramen ovale viewed on the Side of 
A. A Valve that throws it f elf on the Side of the 
Left Auricle, and appears clofed up chiefly 
by a Continuation of the Membrane that lines 
this Auricle. 
B. The Place where this Valve leaves a Hole, which 
opens into the Left Auricle* 
different Sorts. 
Adult. 
the Right Auricle. 
C. The 
