The exterior of the horse . sors of the first dentition, M. Bizard^has succeeded in obtaining the jaws of a colttwenty-eight months of age, in which the infe-rior pincer of the left side did not exist. More recently- our colleagues, and Joly,* have mentioned the absenceof the inferior pincers of the first and second dentition in a subject which they have been able to observe during a sufficientlength of time. M. Ch. Morot^ has also presented to the Central Society of VeterinaryMedicine two analogous cases, but involving the superior corners. Besides, hehas demonstrated that this n
The exterior of the horse . sors of the first dentition, M. Bizard^has succeeded in obtaining the jaws of a colttwenty-eight months of age, in which the infe-rior pincer of the left side did not exist. More recently- our colleagues, and Joly,* have mentioned the absenceof the inferior pincers of the first and second dentition in a subject which they have been able to observe during a sufficientlength of time. M. Ch. Morot^ has also presented to the Central Society of VeterinaryMedicine two analogous cases, but involving the superior corners. Besides, hehas demonstrated that this numerical reduction of the teeth is in obedience tothe laws of heredity. He has also shown that the non-existence of the milk-teeth means a suppression of the corresponding permanent teeth ; at other times,on the contrary, the eruption of the latter was not in the least hindered. 2d. Canines.—The absence of the superior canines, either on one sideor on both, is more frequent than that of the inferior. But it is very excep-. FiG. 313.—Absence of the inferiorcorners. Riulolphi, cité par Isidore Geoffroy Saint-Hilaire, in Histoire générale et particulière desanomalies de lorganisation, t. i. p. 658. 2 Mégnin, cité par le Dr. Magitot, loc. cit., p. 103, et suiv. 3 Bizard, note communiquée. ^ Laine et Joly, note communiquée, 1887. 5 Ch. Morot, in Balletin de la Société centrale de médecine vétérinaire. Séance du 23Novembre, 1882. 720 THE EXTERIOR OF THE HORSE. tional to find these teeth altogether al)sent, as in the horse of which we have ^spoken. 3d. Molars.—As to the molars, we have seen only two examples of thisanomaly in the superior jaw. 2. Irregularities of Form. In certain subjects, says Girard,^ the incisors of the superior jaw pre-sent, at the age of six years, a well-marked triangular form, almost the same asis observed at fourteen or fifteen years of age. This premature triangular form,which we have often noticed, even at five years of age, cannot lead
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