52 



HITCHCOCK'S ANATOMY 



Fig. 61. 



Fig. 62. 



Vertical Section of Iluraan Incisor, a, 

 the point where the Gum is attached to 

 the Tooth. 



Fig. 63. 



Fig. 64. 



A View of an Incisor and of a Molar 

 Tooth, given by a Longitudinal Section, 

 and showing that the Enamel is striated 

 and that the Strife are all turned to the 

 center. The Internal Structure is also 

 seen. 1, The Enamel. 2, The Ivory. 3, 

 The Cavitas Pulpi, 



A Vertical Section of an Adult Bicuspid, 

 cut from without inwards; magnified four 

 times. 1, 1, The Cenientum which sur- 

 rounds the Root up to the commencement 

 of the Enamel. 2, 2, The Dentine of 

 the Tooth, in which are seen the greater 

 Parallel Curvatures, as well as the position 

 of the Main Tubes. 3, Apex of the Tooth, 

 where the Tubes are almost perpendicular. 

 4, 4. The Enamel. 5, The Cavity of the 

 Pulp, in which are seen, by means of the Glass, 

 the Openings of the Tubes of the Dental Bone. 



all the tooth above the gums. 

 This is a pure white sub- 

 stance, thickest upon the top 

 of the crown, and gradually 

 growing thinner towards the 

 gum, where it disappears al- 

 together. Under the micro- 

 scope it is seen to be made 

 up of minute hexagonal fibers, 

 one end of which rests upon 

 the Dentine, and the other 

 forms the free surface of the 

 tooth. These tubes or fibres 

 are slightly undulating and 



