PLATE 3 



EXPLANATION OF FIGURES 



11 Section through tooth germ in the anterior part of the jaw of a 30 mm. 

 embryo showing the wide separation from the oral epithelium. Compare this 

 figure with figure 1. X 560. 



12 Section through the tooth germ of the sixth front tooth of a 53 mm. em- 

 bryo. The parts of the enamel organ are at the height of their development but 

 the enamel pulp bears no resemblance to a stellate reticulum. X 560. 



13 Section through the sixth front tooth of a 78 mm. embryo. X 200. 



14 Section through the sixth front tooth at birth (108 mm.). X 200. 



68S 



