THE MOVTH. 



351 



at the bottom of the infimdibulum. Nevertheless the n„n„f f 

 m this cul-de-sac is not always the samJ wp W 1™»t.ty accumulated 



null, and on the other hand we possess noil '* sometimes almost 



which the cavity is almost enfoellobXucted bv ZT"'^ ""T^^ '"• '"^ 



Fisr. 1.39. 



INCISOE TEETH OP THE HORSE. DETAIIS OF STRUCTtJEE. 



1, A tooth in which is indicated the general shape of a permanent incisor, and the 

 pai-ticular forms successively assumed by the dental table in consequence of 

 friction, and the continued pushing outwards of these teeth ; 2, A virgin tooth, 

 anterior and posterior faces ; 3, Longitudinal section of a virgin tooth, intended 

 to show the internal conformation and structure. Not to complicate the figure, 

 the external cement, and that amassed in the infundibulum, has not been 

 exhibited. 4, Transverse section for the same purpose; i.i, Encircling enamel; 

 b. Central enamel ; c, Dental star ; d, Dentine ; 5, Deciduous tooth. 



All the characteristics just indicated belong to the deciduous teeth 

 (Pig. 159, 5), except that they are smaller than the permanent; that they 

 are of a shining milky-wliite colour, due to the thinness or absence of the 

 crusta petrosa ; that they show at the point of union between the free 

 portion and the root, a constriction named the nech ; that their crown is finely 

 striated, and not cannular, on the anterior face ; that the external cul-de-sac 



