THE DEVELOPMENT OF THE JAW. 



185 



the results of which we see in the separation which comes 

 about between each one of the temporary teeth, prior to 

 their being shed, where the process of dentition is being 

 carried on in a perfectly normal manner. 



Measurements taken for the sake of comparing adult jaws 



with those of an eight months child, give closely similar 

 results, which I have endeavoured to roughly embody in 

 the accompanying figures. 



In these it is shown that the increase in the dimensions 

 of the jaw has taken place in two directions; by prolongation 

 backwards of its cornua concomitantly with the addition at 

 the back of the series of teeth of the true molars, which follow 



(*) Diagram representing a jaw of a nine months fetus, superimposed 

 upon an adult jaw, to show in what directions increase has taken place. 



