Chap. VI. The Jnatomy of a HORSE. 8 5 



bone, and to its back Part. It has likevvife two Perfora'' 

 tions, one on either fide, which have Communication with 

 the two Holes of the Wedge- Hke Bone. 



The lower JaWjWhich makes the lower part 7?-^ Icnveryaw, 

 of the Capacity of the Mouth, comes next I'-'ith its Parts. 

 to be treated of. This difiers from the former, in that it 

 is moveable, whereas the other is not. At both Ends of it 

 there are two Procefl'es, the foremoft of w^hich running up- 

 wards, and from a broad Bafis growing fharp, ends in a 

 Cone or Point. It is this Point that receives the Tendon of 

 the Temporal Mufcle ; from whence it is, that a Luxation 

 of the lower Jaw is very dangerous, if not fpeedily reduc'd. 



The other, wliich is the backward Procefs, is called jfrti- 

 mlaris, having a Neck and a longifli Head covered with a 

 Grillle, by which it is receiv'd and articulated into the Sims 

 of the Os petro/um,2Lr\d it is ftrongly knit thereto by a mem- 

 branous Ligament. It hath, at the Sides of thofe Proceffes, 

 fmall (hallow Cavities, for the Lodgment of its Mufcles. 

 Towards its back Part it hath a Cavity within it, which con- 

 tains a marrowy Juice for itsNourifhment. It has alfo four 

 Perforations or Holes, whereof two are at the Roots of the 

 Procefles, by which a V^ein and Artery, as alfo a Branch of 

 the fifth Pair of Nerves do pafs to the Teeth. The other 

 two are in its Fore- part, giving Way to two Twigs of the 

 faid Pranch, which go out to the lower Lip. 



But the lower and upper Jaw have Sockets for the Teeth 

 to ftand in, which by Reafon of their Depth, have been 

 called Jheoli : When any of the Teeth fall out, as the 

 Foal Teeth, &c. thefe Pits foon become obliterated, and the 

 Jaw grows fmooth. 



The Teeth are of a Subftance harder than ^, n- , 

 any of the. other Bones, which is abfolutely 

 neceflary, confidering their Office is to break and cut all 

 the Aliment. That Part of them which Hands out above 

 the Gums, is fmooth and free from any Covering, but all 

 within the Sockets of the Jaws is more rough, and covered 

 with a thin Membrane of exquifite Senfe. Thofe which 

 are called Grinders, have a manifeft Cavity within them, 

 hut the Fore- teeth and Pog- teeth have but very obfcure 

 ones. By the fmall ^oles which are difcernable in the 

 Roots of the Teeth, is conveyed into thefe Cavities a capil- 

 lary Branch of an Artery from the Carotidsy a fmall Veia 

 from the Jug.ularSy and a Twig of a Nerve from the fifth 

 Pair, which being expanded through the thin Membrane 

 Q X that 



