TEETH. 



[ 754 ] 



TEETH. 



may be displaced by liquids. By reniuving 

 the inorganic salts iVom a tooth with dilute 



Fig. 729. 



Tvory-tulies of a fang of a human tooth, or, inner 

 surface of the ivory, witli fiw tubes ; h, their branches ; 

 c, their terminations in loops ; d, granular layer, con- 

 sisting of small ivory globules at the boundary of the 

 ivory; e, lacunie of bone, one anastomosing with an 

 ivory-tube. Mognilled 50 diameters. 



muriatic acid, and macerating the remaining 

 cartilage with acids or caustic alkalies until 

 it forms a pasty mass, the tubes may be 

 isolated from the basis. 



Fig. 730. 



< ® ® .^ ®*^ I 

 \s ® ® ®/ 



Transverse section of the ivory-tubea. a, closely 

 aggregated; 6, wider apart. Magnified 4-50 diameters. 



In sections made from fresh teeth, high 

 powers of the microscope (-500 or 1000 

 diameters) being used, it is not difficult to 

 recognize, especially in the centre of the 



Fig. 731. 



Perpendicular section of the apex of a human incisor 

 tooth. «, pulp-cavity ; 6, ivory ; c, curve'd contour lines 

 with interglobular spaces; (/.cement; c, enamel, with 

 indications of the course of the tiliris in various direc- 

 tions ; y, coloured stripes of i he enamel. 



Magnified 7 diameters. 



