(131) 



Fig. VI. Three series of pulsations one above tlie other during quick rotation of 

 tlie cylinder. 



In all three a = the pulsation of the arteria radialis, b = the respiration 

 c = the tuning-fork of 10 vibrations per seconds, cf = the abscis. 



The highest I has been taken before — , the middle II during — , the 

 lowest III after the sura. 



The figures give the duration of the pulse in '/20 of seconds (half vibra- 

 tions of the tuning-fork). Those along the upper border give the duration 

 of pulsation. Those along the lower border give the division of the length 

 of a pulse by the dicrotism. 



(Prof. Saltet, March 1898.) Reduced to '/■:! of i's size by means of pho- 

 tograpiiy. 



is more clearly noticeable after the sura than before, and also the 

 longer oscillations return. (See the graphical representation fig. VII 

 for the different oscillations, the acceleration, the amphibole stadium 

 and the compensatory retardation as consequences of exertion). 



The acceleration of the pulse under such circumstances has, ho- 

 wever, been known since Thanhofer. The compensatory retardation 

 has not had due acknowledgment. And yet, compare fig. V, it may 

 be very considerable. 



But this is not all that happens. During the sum the blood- 

 pressure in the radial artery seems to increase, at least the curve 

 rises, and at the same time the form of the pulse-curve chan- 

 ges somewhat. Though the shortening of the duration principally 

 influences the diastole of the heart, yet the dicrotism moves a little 

 nearer to the top when the pulse is short, than when it is long. 



At least in an absolute sense. Comparatively, however, the dicro- 

 tism has moved farther from the top. Compare fig. VI. 



Summa sumraarum. During the exertion of the attention the pulse 

 is accelerated. After that it becomes slower. The acceleration sets 

 in at once, at least if the other influences on the duration of the 

 pulse are taken into account. 



Let us now turn to the respiration. This is registered by the 



