H'cemajlatks. 1 6 1 
13. Ic was computed above, that the Force 
of the Blood in the Dog's Artery could not 
probably increafe more in its mofl: violent 
Motion than from eighty its natural State to a 
hundred ; that is one fifth part more. But in 
the Veins the Difference is manifefUy greater, 
for in the Mare it rofe from twelve to fifty two 
Inches, and would probably have rifen to fix- 
ty Inches if the Tube had been longer, i. e. 
five times its natural equable Height. And in 
the Dog, Numb, 10. it rofe from five to twen- 
ty four Inches, that is, near five times as high: 
14. Now ic was obferved in Experiment 
VII. Numb. 4. that when a Dog's Belly was 
compreffed with the Hand, the Blood would 
conftantly rife a few Inches in the Tube fixed 
to his Artery, and lubfidc again when the Hand 
was taken off ; and in like manner the increas- 
ed Force of the Blood in the Veins, feems to 
arife chiefly from the Conftriftion of the 
Abdomen : For when we exert our Strength 
in lifting or the like, we conftantly contrail 
the Abdomen what we are able, by the joinc 
A£Hon of all its furrounding Mufcles ; and the 
Diaphragm is alfo further affifted in that Ac- 
tion, by keeping the Lungs and Thorax did 
tended with Wind, which is there pent in by 
M hindering 
