CHAPTER II. 
not diltinguifli the bones of the fcull only, as they are divided by futures, 
but according to the differences of their texture, figure, fituation, or ufe. 
Thus they called thefe parts os fpongiofum; a procefs of the temporal 
bone, joined to the os malic, os jugale, dec. 
Maxilla inferior (Tab. ix.) is articulated with loofc cartilages to the term 
poral bones, by two procefles, named condyloides. Near thefe arife two 
more, called coronalcs, and at the infide of the chin a fmall rough pro- 
ceffus innominatus. In the infide of this bone under each proceffus co- 
ronalis, is a large foramen which runs under the teeth, and pafies out near 
the chin. In this foramen, the veflels pals that belong to the teeth; and 
in the upper edge of this jaw arc the fockets for the teeth, which feldom 
exceed fixteen in each jaw; the four firff in each arc called incifores, the 
two next canini, the reft molares; the four laft of thefe are named den¬ 
tes fapientk, becaufe they do not appear till men arrive at years of dif- 
cretion. The incifores and canini have only one fingle root, but the mo¬ 
lares more; the eight firft, two; and the reft, fome three, fome four, ef- 
pecially in the upper jaw; where alfo they arc fpread wider, becaufe that 
jaw being more fpongy than the other, the teeth need more fpace to fix 
them. Each of thefe roots has a foramen, through which pafs an artery, 
vein, and nerve, which are expanded in a fine membrane that lines the 
cavity in each tooth. Thefe veflels and membrane are the feat of the 
tooth-ach. The teeth of children caft off while they are growing; but 
the fucceeding teeth arife in new fockets, deeper and larger than the for¬ 
mer ; for the jaws increafing faftcr than the teeth, muft otherwife have 
left chafms between them, fuch as are in the mouths of brutes; but where 
teeth are drawn in adult bodies, the fockets clofe, and new ones very 
rarely fucceed. 
