1913.] Lability of Arterial Wall on Blood Pressure. 369 



Fig. 7. 



Fig. 8. 



B 













/ 







B 



Fig. 9. 



Fig. 10. 



A < B 



Fig. 10 shows the pressure curve taken from the carotid artery of a dog — 

 A, through the rubber pressure tubing: B, through 5 inches of human 

 femoral artery. The greater approximation of systolic and diastolic pressure 

 and the diminution of the dicrotic wave is evident. 



These results confirm our previous conclusion that the nature — " lability " 

 — of the arterial wall notably affects the conduction of the pressure wave, 

 and therefore both the form of the sphygmogram and the readings of pressure 



