Chap. VI. The Anatomy of a HORSE. 89 



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

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

 the Marrow contained within it. 



The VerUbroi of the Loins, which compofe the third 

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

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

 ing i their hind Procefles, or Spines, grow fhorter, but 

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

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

 wards ; but as to their internal Procefles, they exceed thofe 

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

 a clammy Griftle, asalfo the uppermoft of them to the 

 lalt of the Back, and the loweft to the firft of the Os fa- 

 (rum^ by the fame Kind of Articulation. Thefe have alfo 

 feveral Perforations for the Ingrefs and Egrefs of Nerves 

 and Blood vcllels, as alio a large Cavity in each for the 

 fpinal Marrow, 



Diredly oppofite to the upper Vertehrcs a-, e*^ 

 r 1 r) I i- J .u o, r> /I V/t-ff bternum er 



of the Back, is feated the Sternum or Breaft- Breafi-bone 



bone, which is very different in a Horfe from 



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



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



Subje^, 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 7'ime 



become fo united, as to leave no Marksof their ever having 



been divided. 



In its upper Part it is pointed and fharp, whereas its lower 

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

 called the Cartilago Enfjformis^ 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 Sitms'^y or Cavi- 

 ties, for that Purpofe. 



The Collar-bones, which are the firft that 7'/6^CIaviculac, 

 are united to the Breaft-bone,are in Number °^ Collar-bones. 

 two, one on each fide ; they are called Cbviculie^ either 

 becaufe they refemble the ancient Keys, which were in (hapc 

 like an Italian f^ or becaufe they lock up and clofe the 

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

 dle fomey/hat 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 firft Rack-bone of the Back, dif- 

 fering 



