'i 02 7he Anatomy of a HORSE. 



Duds contrad thenirclves at equal Diftances, and have al fa 

 iheir little Flood-gates, \\\\\c\\ permit their Liquor to take 

 its Courfe towards the Ch)'la- Vcllels, but hinder its coming 

 back the fame Way ; by all which Means the animal Body 

 can never be depriv'd of its Nourifhmcnt, but in Cafe ot 

 Sicknels or Want. 



- r, . The Chyle being prcpar'd in the Sr.omach 

 Its Entrance in- n /- . u i ur i j 



to the Blood. '^^'^ imall Lruts, as has been obiervcd, and 

 being alfo further refined by the Commix- 

 ture of the Lympha^ in its Paflaoc through the Ladteals and 

 Thoraick Dud, is conveyed by that Canal to the left fub- 

 clavian Vein, where it opens itfelf at feveral Orifices, and 

 mixing with the Blood, is carried diredly to the right 

 Ventricle of the Fleart, and is no farther to be traced under 

 the Name of Chyle, but henceforth becomes a Part of the 

 Blood. 



Now, that all the Blood takes a circular Courfe thro' the 

 Heart, is an Opinion fo generally received, that I need l^iy 

 nothing about it, but proceed to fliew the Way and Man- 

 ner by which that is perforni'd. 



en n- 1 r The afcendins: and dcfccndingTrunks of 



TJje Circulation ,, ^ .^ riTi» j 



of the Blood ^'''^ Cava unite oppohte to the Heart, and 



thro' the Heart, Open into iis right Auricle, or Ear ; and at 

 ^'c, the Place where they enter, there is a iinall 



Protuberance made by their Coats on the 

 InfidCi like an Illhmu^^ which hinders the Blood of either 

 Trunk from rufliing againil the other, but direds both 

 into the Ear. The right Ear receives in its "Diajhlc, that 

 is, when it isdiftended, all the Blood from both Branches 

 of tlie Cava, which it empties by its Syfiole into the right 

 Ventricle of the Heart, wliich at the fame Tinre is in its 

 DiajJoIe. The right X^cntricje in its Syjhle prefently 

 empties itfelf into the Pulmonary Artery, or that of the 

 Lungs, for it cannot leturn back again into the Ear, be- 

 caufe of the Valvules Tricufpides ; as that which is once 

 receiv'd into the Ear cannot return into the Cava, bccaufe 

 of the tendinous Circle about its Mouth, which contrads 

 itfelf as often as the Ear is filled. As often as the Blood 

 has taken its Progrefs through ail Parts of the Lungs, in the 

 Pulmonary Artery, it is receiv'd from its capillary Branch- 

 es, into thofe of the Pulmonary Vein, and is convey'd by it 

 back agnin into the left Ear of the Heart, which, by its Con- 

 tradiun, thrults the Blood into the left Ventricle, then in. 

 its Dhijiole ; and when that is contraded, it is thruft out 



into 



