MOTION OF THE HEART AND BLOOD 



beats of the artery you will see the hand become 

 impacted and gorged with a great amount of blood 

 "drawn" by this medium tight ligature, but with- 

 out pain, heat, horror of a vacuum or any other 

 cause so far proposed. 



If one will place a finger on the artery as it beats 

 at the edge of the bandage, the blood may be felt 

 to flow under it at the moment of loosening. The 

 subject, also, on whose arm the experiment is made, 

 clearly feels, as the ligature is slackened, warmth 

 and blood pulsing through, as though an obstacle 

 has been removed. And he is conscious of it follow- 

 ing the artery and diffusing through the hand, as 

 it warms and swells. 



In the case of the tight bandage, the artery is 

 distended and pulsates above it, not below; in the 

 mediumly tight one, however, the veins become 

 turgid and the arteries shrink below the ligature, 

 never above it. Indeed, in this case, unless you 

 compress these swollen veins very strongly, you 

 will scarcely be able to force any blood above the 

 ligature or cause the veins there to be filled. 



From these facts any careful observer may easily 

 understand that blood enters a limb through the 

 arteries. A tight bandage about them "draws" 

 nothing, the hand keeps its color, nothing flows 

 into it, neither is it distended. With a little slacken- 

 ing, as in a mediumly tight ligature, it is clear that 

 the blood is instantly and strongly forced in, and 

 the hand made to swell. When they pulsate, blood 



[87I 



