168 



THE PATHOLOGY OF* THE TEETH. 



with an irregular position of the upper grinders rela- 

 tively with the lower. 



" Sometimes the horse, when at pasture, is unable to 

 take a sufficient quantity of food to keep himself in 

 condition, and consequently he is considered legally 

 unsound. But if fed from the manger he experiences 

 little trouble in collecting his food; nor will his ability 

 to masticate it be interfered with, except perhaps in 

 old age. 



PARROT-MOUTH. TEN LINES TOO LONG. 



(Brandt,} The cutting forceps, sliding-chisel, or file will at least palliate 

 the worst cases, otherwise, as Prof. Varnell says, the roof of the mouth 

 may become diseased and mastication impaired. Irregularities of the in- 

 cisors, he says, both with reference to their position and number, are even 

 more common than in the grinders, but they seldom cause actual disease. 



Prof. William Williams, like Prof. Varnell, has per- 

 formed his part in elucidating the subject of caries of 

 the teeth, and he has also illustrated the transmission 

 of vitality to them from the outside through the me- 

 dium of the cement after it has ceased to flow through 

 the pulp on the inside, the pulp having become con- 

 verted into dentine. It appears that anything that 

 disturbs the equilibrium of this flow of vitality, which 

 is the secret of the growth of the teeth throughout 



