THE TEETH AND THE TONGUE. 57 



upper jaw, and the denominator the number in one 

 side of the lower jaw; as, If, C1-. IJ indicates 

 that there are two incisor teeth in one side of the 

 upper jaw and three in one side of the lower jaw. 



a. Write the formulae for the premolar and the molar 

 teeth. 



b. What are the wisdom teeth ? 



D. The Teeth of the Lower Animals. 



Materials. The teeth of a horse or cow. The teeth of a cat or 

 dog. 



1. Study the teeth of an herbivorous animal and compare 



them with the human teeth. 



2. Study the teeth of a carnivorous animal and compare 



them with both the preceding. 



E. The Tongue. 

 Apparatus. A hand-mirror. 



With a hand-mirror examine your own tongue. 

 Notice : 



a. The small papillae that cover most of the upper sur- 

 face of the tongue are the filiform papillae. 



b. The larger papillse that are scattered occasionally 

 over the surface are the fungiform papillae. 



c. The very large papillae, or the circumvallate papillae, are 

 situated as far back on the tongue as you can see. How 

 are they arranged ? 



d. Sketch. 



