ANIMAL DENTISTRY 



23 



iiifiindiljula. In animals having siniple teeth it is limited to 

 the fangs. Chemically, it is composed of: 



Carbonate of lime '].22 



Phosphate of lime 48.73 



Fluoride of lime a trace 



Phosphate of magnesia 99 



Soluble salts 82 



Cartilage 4i-3i 



Fats 93 



Microscopically it presents the typical characteristics of 



Fig. s. 

 Dentine and Crusta Petrosa as Ar- 

 ranged at the Fang (Magnified). 



1. Crusta petrosa. 



2. Spaces of Czermak. 



3. Dentine. 



Fig. 6. 

 Natural Cavities of a Molar. 



A. Pulp cavity. 



B. Infundibulum. 



the compact tissue of bone, the canaliculi of which communi- 

 cate with those of the dentine. It is intimately associated 

 with the alveolo-dental periosteum, which membrane is con- 

 cerned in its formation. 



