The Inner (Alimentary) Tube and Its Respiratory Derivatives 



13 



SECOND 

 PERMANENT- 

 MOLAR 



Fig. 39. The teeth of a five-year-old child. Portions of the jaws have been 

 removed so as to expose the roots of the milk-teeth and the partially developed 

 permanent teeth. The latter are stippled in the figure. (After Sobotta. Courtesy, 

 Neal and Rand: "Chordate Anatomy," Philadelphia, The Blakistou Company.) 



Fig. 40. Jaws of a six-month-old lion. (After Weber.) Milk-teeth white, perma- 

 nent dotted, (c) Canines; (0 incisors; (m) molars; (p) premolars. (Courtesy, 

 Kingsley: "Comparative Anatomy of Vertebrates," Philadelphia, The Blakistou 

 Company.) 



