The Body is the greatest Part, and the middle of the Bone; the Ends are the two Extremities; the Heads are the great Protuberances at the Extremities; the Neck is that Part which lies immediately under the Head; the _Apophyses_ or Processes are certain Bunches or Knobs at the Ends of the Bones, which constitute a Part of them; the _Epiphyses_ are Bones added to the Extremities of other Bones; the _Condyli_ or Productions are the small Elevations or Extuberances of the Bones; the Cavities are certain Holes or hollow places; the _Supercilia_ or Lips are the Extremities of the Sides of a Cavity, which is at the End of a Bone; the Ridges are the prominent and saliant Parts in the length of the Body of the Bone. {14} _How are the Bones join'd together?_ Two several ways, _viz._ by _Articulation_ and _Symphysis_. _How many sorts of Articulations are there in the Bones?_ There are generally two kinds, _viz._ _Diarthrosis_ and _Synarthrosis_. _What is Diarthrosis?_ _Diarthrosis_ is a kind of Articulation which serves for sensible Motions. _How many kinds of Diarthroses, or great Motions are there?_ There are Three, _viz._ _Enarthrosis_, _Arthrodia_, and _Ginglymus_. _Enarthrosis_ is a kind of Articulation which unites two Bones with a great Head on one side, and a large Cavity on the other; as the Head of the Thigh-Bone in the Cavity of the _Ischion_ or Huckle-Bone. _Arthrodia_ is a sort of Articulation, by the means whereof two Bones are join'd together with a flat Head receiv'd into a Cavity of a small depth. Such is the Head of the Shoulder-Bone with the Cavity of the _Omoplata_ or Shoulder-Blade; and that of the Twelfth _Vertebra_ of the Back with the first of the Loins. _Ginglymus_ is a kind of Articulation which unites two Bones, each whereof hath at their Ends a Head and a Cavity, whereby they both receive and are received at the same time, such is the Articulation in the Bones of the Elbow and the _Vertebræ_. _What is _Synarthrosis_?_ _Synarthrosis_ being opposite to _Diarthrosis_, is a {15} close or compacted Articulation, destitute of any sensible Motion. _How many sorts of _Synarthroses_, or close Articulations are there?_ There are Three. _viz._ _Sutura_, _Harmonia_, and _Gomphosis_. A _Suture_ is that which joins together two Bones by a kind of Seam or Stitch, or by a Connexion of their Extremities dispos'd in form of a Saw, the Teeth whereof are reciprocally let one into another: Such are the Sutures of the Skull-Bones. _Harmonia_ is the uniting of two Bones by a simple Line; as the Bone of the Cheek with that of the Jaw. _Gomphosis_ is a kind of close Articulation, which unites two Bones after the manner of Nails or Wooden Pins fixt in the Holes made to receive them: Such is that of the Teeth in their Sockets. _What is _Symphysis_?_