160 MICROSCOPIC ANATOMY OF THE TEETH 



An examination of fragments of the enamel cap in human 

 unerupted teeth, treated in the same manner, also showed 

 the same appearances (fig. 92), but owing to the more rapid 

 and dense calcification in human teeth the calcospherites are 

 more difficult to detect, the separation of the laminae not 

 taking place to the same depth in the forming enamel as in 

 marsupials. As in the first case, large calcospherites are 

 seen free in the surrounding fluid ; but while in marsupials 

 these bodies are all round in form, in human enamel they 



FIG. 91. Portion of enamel from specimen shown in fig. 90 more highly 

 magnified, showing the beading of the prisms (a) and large radial calco- 

 spherites in the laminae. ( x 1,000.) 



are mostly oval, very few round ones being seen. They 

 have the same radial structure, however, and two or more 

 are frequently found fused together, forming an irregular 

 mass. 



A scraping from the surface of the enamel of a human 

 tooth still in the crypt showed a large mass of calcospherites, 

 the larger ones all having this oval form (fig. 93). Large 

 scattered spherites are also seen in human enamel, which are 

 uniformly and finely granular. 



It is thus seen that there are in forming enamel two 



