ENAMEL 117 



that this resorption may be due to the action of the enamel 

 cells. This resorptive process, he thinks, has cut off the 

 enamel tubes from any connexion with the dentinal tubes. 

 In man, where only very short portions of the dentinal 

 tubes enter the enamel, isolated enamel tubes are not found. 

 The crevices in human enamel he considers only occur 

 through drying or shrinking of the interprismatic substance. 



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