106 



ADVANCED LESSONS IN PRACTICAL PHYSIOLOGY 



The recording needle of the manometer having been placed against 

 the smoked paper of the kymograph, allow a small quantity of sodium 



FIG. 68. RECORD OF BLOOD-PRESSURE SHOWING THE CARDIAC AND RESPIRATORY VARIA- 

 TIONS. 

 The time, registered in seconds, serves as the abscissa. 



carbonate to enter the connecting tubes from a receptacle suspended 

 above the manometer. Remove the clip from the artery, and adjust 



FIG. 69. TRAUBE-HERING CURVES. 



The time is given in seconds. The smallest pulsations represent the cardiac varia- 

 tions, those of intermediate size the respiratory variations, and the large waves the 

 Traube-Hering variations. 



the speed of the drum so as to render the individual cardiac variations 

 clearly perceptible. Observe the character of the respiratory varia- 



