( 127 ) 



the oscillation caused by pulsation. At the moment when the curve 

 of such a long oscillation rises high above the abscis, the duration 

 of the oscillation of the pulse is long ^). The increase of the volume 

 of the brain is preceded by acceleration of the pulse, as appears 

 from the graphical representation in fig. IV and from the figures 

 in the note. 



bot 



u 



\9 



^i 



h 



St 

 l« 



\ \ A , 



Fig. IV. Grnpliical representation of the duration ot the pulsations in seconds, 

 compared to the elevation of the tracing of the volume of the brain 

 above the abscis at every pulsation. 



A. Height above the abscis of the volume of the brains in niM. 



B. Duration of the pulse in seconds, (Gbauzs, see tig. It.) 



So it is clear, that in registering the pulsation of an artery, we 

 must find the same acceleration and retardation, which returns at long 

 irregular intervals and is not dependent on the respiration. 



•) If we measure the height above the 

 cylinder rotates quickly, and the duration 

 corresponds to that height, we find : 



Height Duration of Height Duration of 

 above abscis pulsation above abscis pulsation 

 iu luM. in seconds, in niM 



abscis of the long oscillation, when the 

 of every oscillation of the pulse which 



5.00 

 5.25 

 5.00 

 5.25 

 4.75 



0.62 

 0.62 

 0.02 

 0.65 

 0.675 



4.25 

 3.50 

 3.00 

 2.25 

 1.75 

 2.00 

 1.75 



in seconds. 

 0.65 

 0.725 

 0.75 

 0.775 

 0.77 

 0.77 

 0.77 



Height 

 above 

 abscis. 

 1.75 

 2.50 

 3. 



2.75 

 3.00 

 3.50 

 4.25 

 4.50 



Duration of 

 pulsation 

 iu seconds. 

 0.675 

 0.65 

 0.625 

 0.65 

 0.625 

 0.625 

 0.625 

 0.6 



Height Duration of 

 above pulsation 

 in seconds. 

 0.65 



abscis. 



4.50 



4.50 



5.00 



5.00 



4.25 



3.75 



3.75 



3.50 



0.625 



0.625 



0.65 



0.65 



0.65 



0.65 



0.65e(,c. 



