486 STRUCTURE AND DEVELOPMENT OF TEETH, W. WALDETER. 



reassume the form of the original columnar cells, and the dis- 

 tinct membranous investment of the longer sides comes into 

 view. The disappearance of the nucleus in such calcifications 

 and metamorphoses of cells is so common, that there is nothing 

 remarkable in its absence in those of the enamel. 



Fig. 103. 



Fig. 103. Highly magnified. 1. Various forms of odontoblasts. 2, 

 Three enamel cells, with a few cells of the stratum intermedium at- 

 tached ; two enamel cells exhibit Tomes' processes. 3. An enamel 

 cell, with a small portion of enamel. 4. Fragments of enamel fibres 

 from young and still soft enamel (acicula). 5. Old enamel fibres with 

 transverse striae. 



Kolliker (58) has recently so far inclined towards the view pro- 

 pounded above, that he appears inclined to explain the formation of 

 enamel in the same sense as Schwann (23), who held that the 

 enamel cells continued to grow at their free extremities, and that the 

 new growth underwent continuous calcification, Hertz (52) and 

 myself (49) transfer the growth of the cells to the nucleated extremity 

 directed towards the stratum intermedium, which is more in accordance 

 with the facts observed, and with the general mode of increase of cells ; 

 for the nucleus, with the immediately surrounding protoplasm, is 



