THE TEETH AS AN INDICATION OF AGE 35 



out and the new or permanent tooth soon is estab- 

 lished in its place. 



LOSING OF TEMPORARY TEETH 



According to the observation of Mayo, the tem- 

 porary incisors are replaced by permanent teeth 

 as follows : " The two central incisors are shed at 

 about two and a half years, and the permanent ones 

 are up ' in wear ' at three years. The lateral in- 

 cisors are shed at three and a half and the per- 

 manent ones are up and in wear at four years. The 

 corner incisors are shed at four and a half and the 

 permanent ones are up and in wear at five. 



" The molars are erupted and replaced as fol- 

 lows: The fourth molar on each jaw (which is 

 always a permanent molar) is erupted at ten to 

 twelve months ; the fifth permanent molar at two 

 to two and a half years, and the sixth usually at four 

 and a half to five. The first and second molars, 

 which are temporary, are shed and replaced by per- 

 manent ones at two to three years of age. The 

 third temporary molar is replaced by a permanent 

 one at three and a half years. In males, the canine 

 or bridle teeth are erupted at about four and a half 

 years of age. At about five years of age a horse is 

 said to have a full mouth of permanent teeth." 



THE MARK IN THE TOOTH 



Horsemen make use of the " mark in the tooth " 

 for determining the age between five and eleven. 

 In examining teeth you observe that two bands of 

 enamel are to be seen ; one exterior, that surrounds 

 the tooth, the other interior, which is termed the 

 casing enamel. It is this latter, or "date cavity," 

 that is used to tell the age. 



