902 



5856. The fore part of a Human lower jaw, showing the incisors, canines, and 

 bicuspids, with their crowns worn down to a flat surface. 



The following specimens, illustrative of the structure, development and succession of the 

 Human Teeth, are arranged on slides, in a glazed frame or case, and are figured in John 

 Hunter's Work ' On the Teeth.' 



Hunterian. 



5857. The teeth on this slide are the subjects of Plate v. Op. cit., where they are 

 described as follows : 



" The sixteen teeth from one side of both jaws, taken out of their sockets to expose the 

 whole of each tooth. 



" Row 1 . The teeth of the lower jaw ; the five single are similar to those in the upper 

 jaw, but the grinders in this have only two fangs. 



" (a. a.) The two incisors. 



" (6.) The cuspidatus ; showing, in the same view, how much longer it is than the 

 others. 



" (c. c.) The bicuspides. 



" (d. d.) The first two grinders, having two fangs. 



" (e.) The third grinder, or dens sapientise, having also but two fangs. 



" Row 2. The teeth of the upper jaw ; the lettered references apply to this, as to the 

 first row. 



" (a. a.) The two incisors, showing the hollowed inner surface of the body of those teeth. 



" (b.) The cuspidatus, showing the same. 



" (e. c.) The bicuspides, showing the two points on the basis of each. The first of them 

 has a forked fang. 



" (d. d.) The first two grinders having three fangs. 



" (e.) The third grinder, or dens sapientiee, having also three fangs." 



5858. A slide supporting sections of the teeth of Man, the Horse, and the Elephant, 

 which have been subjected to the action of fire in order to show more clearly 

 the distinction between the enamel and other constituents of the teeth ; the 

 minute quantity of animal matter in the enamel not affecting its colour when 

 heated. Most of the specimens are figured in plates xiv. & xv. Op. cit., where 

 they are described as follows : 



"(a.) Fig. 17. An incisor slit down its axis, to show the enamel upon the body of the 

 tooth, covering much more of the convex than of the concave part." 



" (5.) Fig. ,18. An incisor, worn so much down as to expose the whole end of the bony 

 part, a circle only of enamel remaining." 



