OPENING BETWEEN THE EIGHT AND LEFT AURICLES. 



69 



Table III. — Influence of Age on Foramen Ovale in Males and 



Females combined. 



From this table we may gather that in cases over 20 years of 

 age, of which there are 585, that a patency may be expected 

 in 27"3 per cent, of cases ; the Society's report gives 19-5 per 

 cent. 



Let us now turn our attention to the size of the opening. 



In all, we are able to record 74 cases in which the size was 

 measured. 



The results may be shown in the following table : — 



Table IV. — Size of the Opening between Auricles. 



In the report of the Anatomical Society the measurement is 

 not taken over 1 centimetre, but for sake of comparison we 

 will group our cases of 8 millimetres and over with that of the 

 Society of 1 centimetre and over, as in the following table : — 



