64 THE PERMANENT 



may be found in his "Natural History of the Human 

 Teeth." 



The formation of the enamel is thus described by 

 Prof. Bouley and Surgeon Ferguson ("'Veterinarian/' 

 1844) : 



"In the grinder teeth the enamel may be said to 

 resemble a little ribbon, which forms, in refolding 

 many times upon itself in the interior of the tooth, a 

 succession of undulating planes, and constitutes the 

 hard external envelop of the cubic mass of the organ. 

 An idea of this disposition may be formed on examin- 

 ing a tooth which is not yet cut, but which is ready to 

 be cut. Those that have been worn, present on their 

 crowns, besides the undulating lines of the enamel 

 envelop, a succession of reliefs, salient and sinuous, of 

 the substance of the enamel, which are nothing else 

 than the free borders of this folded ribbon. It is in 

 the intervals of the folds of enamel that is deposited 

 the ivory-colored substance (dentine), which renders 

 the tooth a solid mass when it has attained its full 

 growth." 



Prof. Richard Owen, one of the first odontologists 

 of the age, in whose numerous works descriptions of 

 many kinds of teeth may be found, has paid a fair 

 share of attention to the study of horses' teeth, both 

 recent and fossil. His description of the grinders and 

 comparisons with the teeth of other animals are too 

 interesting to be omitted here, and render any apology 

 for the few repetitions of facts already given unneces- 

 sary. He says (" Odontography," vol. i, p. 572) : 



"The horse will yield us the first example of the 

 dentition of the hoofed quadrupeds with toes in un- 



