HcBinaJlatm. 23 
being forcibly propelled forward, with an ac- 
celerated Impetus^ thereby dilates the Canal 
of the Arteries, which begin again to con- 
trad at the Inftant the Syjlole ceafes : By 
which curious Artifice of Nature, the Blood 
is carried on in the finer Capillaries, with an 
almoft even Tenor of Velocity, in the fame 
manner as the fpouting Water of fome fire- 
Engines, is contrived to flow with a more 
even Velocity, notwithftanding the alternate 
Sjftoles and ^iafioles of the rifing and falling 
Embolus or Force; and this by the means of 
a large inverted Globe, wherein the comprefled 
Air alternately dilating or contrading, in Con- 
formity to the workings to and fro of the Em- 
' boluSy and thereby impelling the Water more 
equably than the Embolus alone would do, 
puflies it out in a more nearly equal Spout. 
27 And fince the Blood in the fineft: ca- 
pillary Arteries, preflTes into the Veins with a 
much more equable Velocity, than in the 
Aorta and greater Arteries ^ fiiicc alfo the 
Syflole is fuppofed to be nearly one third of the 
Time between Pulfe and Pulfe, the ocher 
two thirds of that Time mufl: be fpent in the 
Contradion of the Arteries : it may therefore 
reafonably be concluded, that the Sum of the 
C 4 Dilata- 
