434 



Bayliss and Starling, 



Aorttt 



TentAicle 



the two curves depart 

 from each other is mar- 

 ked in the Figure by 

 the line c. The interval 

 between the two verti- 

 •cal lines, a and &, is 

 the time taken by the 

 ventricular pressure to 

 reach that of the aortic 

 and to open the semi- 

 lunar valves (the "An- 

 spannungszeit" of Gad). 

 The three vertical dot- 

 ted lines of the figure 

 mark the summits of 

 the three waves of the 

 ventricular plateau. 



In conclusion, the 

 points on which we 

 would lay most stress 

 are, that the true form 

 of the normal intraven- 

 tricular pressure curve 

 is that of a plateau 

 with three summits, as 

 originally described by 

 Chauveau and Marey; 

 and that a blood-pres- 

 sure manometer appro- 

 aches accuracy the more 

 nearly, the more per- 

 fectly it gives this form 

 of curve. 



V. \ 



A 



