22 ON THE ORIGIN AND DEVELOPMENT OF THE 



substance had commenced, immediately beneath which the 

 vascularity was intense, both in the substance under, and on 

 the surface a little beyond, the edge of the scale.* This 

 surrounding vascularity had the appearance of a zone, and 

 was situated in the substance and on the surface of an ele- 

 vated portion of the pulp, which surrounded the scale of tooth- 

 substance. 



The granular substance in contact with the tooth-substance 

 and its border had begun to be absorbed, and had consequently 

 become thinner in that situation than elsewhere, allowing the 

 subjacent vascularity to appear through it. No vessel could 

 be detected in the granular substance to account for the 

 absorption of its inner surface. 



The ten little cavities had undergone no change, except 

 that the two or four anterior had become rather longer, and 

 were situated further from the surface of the groove, so as to 

 be placed rather behind than below the sacs. The anterior 

 cavity, in particular, although its walls were still in contact, 

 and required to be separated by the needles under water to 

 see its interior, had become pear-shaped. The fundus or 

 portion furthest from the gum exhibited on its floor a fold, 

 which lay in the direction of the edge of the future permanent 

 tooth, and near its apex there were two other minute folds, 

 one on the anterior wall, the other on the posterior. Beyond 

 this the cavity terminated in an opaque IMPERVIOUS line, 

 which soon disappeared. The substance of the gums had 

 become infiltrated with a quantity of gelatinous matter very 

 similar to the granular substance of the sacs. In consequence 

 of this infiltration the line of junction of the walls of the 

 dental groove had become obliterated, the substances of the 

 gums had become thicker, and the sacs more removed from 

 the surface. 



The open portion of the groove (a, Fig. 19) had disappeared, 



* Sevres, Easai sur I 'Anatomic d la Physiologic dcs Dents, p. 20. 



