CLEARNESS OF THE ENAMEL- FIBERS. 135 



cracks or fissures extending into the enamel. The 

 fibers are rather more wavy in the thicker enamel of 

 the molar teeth (Plate 137, b). 



"It* the enamel is viewed in sulflciently thin sec- 

 tions it is free from those wavy, dusky markings which 

 are produced by the more tortuous fibers of the human 

 enamel; and I have been unable to distinguish any 

 transverse striee in the fine fibers of that tissue in the 

 horse. The appearance of such is given by thicker 

 sections of the enamel-fibers taken obliquely across 

 them, and is produced by the cut ends of the fibers." 



