464 STEUCTUKE AND DEVELOPMENT OF TEETH, W. WALDEYER. 



ably complex structures, yet clearly belong to the same series 

 of formations. 



Fig. 97. 



Fig. 97. Premolar tooth, of the Cat, in situ. Vertical section, magni- 

 fied 15 diameters. 1. Enamel with decussating and parallel striae. 

 2. Dentine with Schreger's lines. 3. Cement. 4. Periosteum of the 

 alveolus. 5. Inferior maxillary bone. 



In the dentinal teeth the connective tissue matrix of the 

 papilla plays a most important part in the hardening process, 

 which here proceeds in a manner precisely similar to the ossify- 



