212 



Canadian Record of Science. 





Table X. 













Table XI. 



First 



Diastolic Wave. 



Second D 



iastolic Wave during 



V 





P 







Dj'spnoea. 



136 





6 



5 





V 



P 



127 





6 



5 





70 



.... -2-5 



120 





6 



5 





69 



.... -2-6 



119 





6 



5 





67 



-2-3 



112 





6 



3 





65 



... -2o 



101 





7 



1 





64 



.... -20 



140 





4 



6) 





63 



.... -20 



136 





4 



2 











130 





4 



8 





Average 



66 



.... -2-3 



124 





4 



8 



s 









114 





4 



5 









112 





3 



2 



' s. 









110 





2 



9 



>J 









106 





2 



8 



^ 









101 





2 



9 











101 





2 



sJ 











Average 118 ' 4 '8 



In the following table the average rates and pressures 

 from the preceding tables are brought together : 



Table XII. 



Wave. 



Presystolic 



Systolic ^Jugular vein. 



I. Diastolic 



Presystolic ■"! 



I. Diastolic I Ttirough inferior vena 





Average 



Table. 



velocity. 



I. 



... 270 



II. 



. . 201 



III. 



. . . . 230 



IV. 



... 268 



V. 



... 138 



VI. 



. . . 223 



VII. 



... 103 



VIII. 



. . . 11.5 



IX. 



... 104 



X. 



. . . 118 



XI. 



... 66 





Ave 



•age 



pressure. 



.. 4 



6 ... 





8 



8 ... 





9 



1 ... 





4 



9 ... 





7 



3 . . . 





2 



6 .. 





5 



6 ... 





2 



7 ... 





2 



1 ... 





4 



8 ... 





-2 



3 ... 



II Diastolic 



cava to femoral. 



The results of the investigation may be summarized as 

 follows : 



1. The changes in the pressure of blood within the right 

 auricle and great veins are propagated through the larger 

 veins of the trunk and extremities, causing a venous pulse. 



2. The rate of propagation of this venous pulse varies 

 between one and three meters per second in round num- 

 bers. This is much slower than the rate of propagation of 

 the arterial pulse, which is to be explained by the lower 

 pressure within the veins, and the differences in the walls 

 of the two kinds of vessels. 



