VELOCITY OF BLOOD IN VASCULAR SYSTEM 1003 



dicrotic elevation, the velocity was also 248 mm. At 3 and 3', towards the end 

 of diastole, the velocity sank to 127 mm. 



The velocity of the blood in the capillaries can be measured by direct observa- 



FIG. 387. Record of blood-velocity in the carotid artery 

 of the rabbit. (CYBULSKI.) 



tion of the capillaries under the microscope, and noting the time it takes for a 

 blood-corpuscle to move from one edge of the field to the other. 



THE VELOCITY IN DIFFERENT PARTS OF THE VASCULAR 



SYSTEM 



During systole the velocity of the blood in any part of the arterial 

 system must be greater than during diastole ; thus in the carotid 

 of the horse the following figures were found : 



During systole 

 During diastole . 



Velocity per second 

 . 520 mm. 

 150 mm. 



The following figures have been obtained from experiments on 

 dogs (Tigerstedt) : 



