Chap. VI. The Anatomy of a HORSE. Sp 



wards as thofe more forwards. As for the great Perfora- 

 lion in their Middle, it is proportionable to their Size, and 

 the iVIarrow contained within it. 



The Vejtebra of the Loins, v;hich compofe the third 

 Part of the Spine, come next to be confidered. They are 

 in Number fcven, and are bigger than any of the forego- 

 ing ; iheir hind Proceiies, or Spines, grow fhorter, but 

 are broader and thicker than thofe of the Back, fome- 

 what bending upwards, as moft of the other decline down- 

 wards ; hut as to their internal Proceiies, they exceed thofe 

 of the Back in Length : They are joined one to another by 

 a clammy Griftle, as alfo the uppermoft of them to the 

 lall: of the Back, and the loweft to the firll of the Os fa- 

 crum^ by the fame Kind of Articulation. Thefe have aifo 

 feveral Perforations for the Ingrefs and Egrefs of Nerves 

 and Blood- vcliels, as alfo a large Cavity in each for the 

 fpinal Marrow. 



Directly oppofite to the upper Vertebra ^, <,^ 

 r .u -D ! • r . J »i c> T> rL V/b^ sternum or 



of the Back, is feated the Sternu?n or Breaft- Breafl-bone 



bone, which is very different in a Horfc from 



what it is in Man, being, in all human Skeletons, flat 



in its Outfide, and pretty ftreight; whereas in our prefent 



Subjedtj it is not only fomewhat arched, but in its Middle 



is prominent and fharp^ like the Keel of a Ship, being alfo 



hollow on its Infide. This Bone in Foals, as in Children, 



feems to be made up of divers Cartilages, which in Time 



become fo united, as to leave no Marks of their ever having 



been divided. 



In its upper Part it is {)ointcd and fharp, whereas its lower 

 Part is fomewhat blunt and obtufe, terminating in a Griftle, 

 called the Cartilago Efififormis, or Sword-like Griftle. 

 Its Ufe is to ferve as a Safeguard to the Breaft, as alfo for 

 the Articulation of the Collar-bones ; and the nine upper- 

 moft Ribs having on each fide nine little Sims'Sy or Cavi^ 

 tts^ for that Purpofe. 



The Collar-bones, which are the firft that IT/^^ Clavicular, 

 are united to the Breaft-bone, are in Number o^ Collar-hones, 

 .two, one on each fide; they 2l\q cdWtd Clavicul^e, either 

 becaufe ihey refemble the ancient Keys, which were in (hape 

 like an Italian /, or becaufe they lock up and clofe the 

 Cheft : Their Heads are fpongy and open, but their Mid- 

 dle lomewhat thin and flat, and fomewhat more folid ; by 

 one End they are joined to the Top of the Breaft-bone, 

 and by the other to the ftrft Rack-bone of the Back, d^S- 



ieiing 



