VE T ERIN A R Y DEN TAL S URGER T. 249 



The incisor teeth of the ox are eight in number, 

 and all located in the lower jaw. 



At birth, all the incisors and temporary molars 

 ( i, 2, 3,) are so far advanced that they may be seen 

 under the gums, and by the end of the first month 

 are through and fully developed. These teeth retain 

 about the same appearance, and no accurate opinion 

 can be formed from observation until the sixth 

 month, when the fourth molar (permanent) makes 

 its appearance. 



At one year and six months the fifth molar 

 appears. 



At one year and eight months to two years the 

 central incisors are shed and replaced by permanent 

 teeth, which are much wider and larger in every 

 respect than the temporary teeth. Somewhat later, 

 the sixth and last molar makes its appearance, and is 

 fully developed by the second year. 



Up to this time, should an error arise with regard 

 to the age of an animal, through the examination of 

 the incisors, it can be corrected by examining the 

 molars. 



At two to two and one-half years, the first and 

 second molars are replaced by permanent teeth, 

 which are up and in wear at three years of age. 

 The third molar is replaced by a permanent tooth 

 about six months later. 



At from two years and four months to two years 



