IMPROVED. 4? 



Chyle, which is a Kind of Bafon form'd for it, by ' 

 the Union of the Lymphatick and Lafleal Veilels. 

 From thence, in one Du6l or Pipe, it afcends the 

 Tf^rax or Breaft j and fometimes dividing about the 

 Heart, it immediately unites again ; and creeping 

 along the Gullet, it pailes in Man to the kft Sub- 

 clavian Vein or Vein in the Arm-Pit > and in 

 Horfes, into a Vein under the left Shoulder*Blade> 

 where, by one or two Mouths it pours in its Con- 

 tents, and there mixes with the Venal Blood, as it 

 returns from all Parts of the Body. But in the fe- 

 cond Acceptation of this Term of Nutrition , where- 

 in it is underftood of the -Blood*s nourishing all the 

 Parts of the Body, fuch Kind of Nutrition is per- 

 formed by a Secretory Duel, or fmall Pipe, ariiing 

 from the Termination or End of an Artery, which 

 carries a fuitable Portion of Blood to every Part to 

 be nourifhed : So that every Point in the Body mull 

 be a Termination of a Secretory Duft, through 

 which a proper Part of the Blood is convey'd, in 

 order to fupply that Part of the Body. And thus 

 much for Nutrition, and the Courfe of the Chyle. 

 Now it remains that I fay fomething about the Cir- 

 culation of the Blood, and Ihew how, and in what 

 Manner, this fo furprizing Piece of Mechanifm is 

 mechanically performed. But firll of the Blood itfelf. 

 By the Blood, fome underftand not only the Fluid 

 in the Veins and Arteries, but likewife that in the 

 Lymphedudls, Nerves, or any other Vefiels of the 

 Body i becaufe they all of them contain Parts of the 

 Blood feparated from it by Force of the Heart, and 

 many of them by the Animal Mechanifm return to 

 it again, after Performance of their deftin'd Task. 

 And in this Acceptation it is taken in the Calcula- 

 tions of its Quantity and Velocities, both in Human 

 and Brute Creatures, which, becaufe it is of the 

 greateil Moment to underlland, I fnall explain in as 

 brief a Manner as may be. But firfl of the Heart 

 itfelf. 



