3 2 Hamafiatm. 
even in the fame Animal the Force of the 
Blood in its Veflels, is continually varying, ac- 
cording to the different Kinds and Quantities 
of Food, the various Diftances of time after 
taking Food, the more or le(s plethoric State 
of the Blood Veffels, alfo from Exercife, Reft, 
different States of Vigour or Vivacity of the 
Animal, and many other Circumftances, 
which may conduce to vary the Force of the 
Blood : For the healthy State of Animals is 
not confined to the fcanty Limits, of one 
determinate Degree of vital Vigour in the 
Blood : But the Allwife Framer of thefe ad- 
mirable Machines has fo ordered it, as that 
their healthy State fliall not be difturbcd by 
every little Variation of this Force, but has made 
it confiftent with a very confiderable Latitude in 
the Variation of it. Nowfince this Force of the 
Blood is fo variable, it is the more requifite to 
be furniflied with a good Quantity of Obferva- 
tions, thereby to find out the more nearly, a 
Medium of thofe Forces, not only in the 
fame Animal, but alfo in thofe of different 
Ages, Sizes and Kinds ; whence haply fome 
curious Obfervations may arife. 
3. Thefe great Inequalities of the Force of 
the Blood, not only in different Animals, but 
alfo 
