60 I *E T ERIN Alt T DENTAL S URQER T. 



owing to this fact that they are more easily extracted 

 than the teeth of the horse. The lower molars each 

 have two roots, while the upper have three roots. 



The following measurements were taken from 

 the teeth of a fair sized pure bred Holstein cow at 

 five years of age. Length of lower rows, 5^ inches; 

 upper rows, 5 T \; distance between sixth lower, 3^; 

 between sixth upper, 3^; distance between first 

 lower, 3^; between first upper, 3; between third 

 lower, 3^; between third upper, 3-J-j. inches. The 

 incisor teeth gave the following measurements: 

 Width of arch, 3^ inches; depth of concave of arch, 

 -J; length of protruding portion beyond the gum of 

 centrals, ^; length of central incisor, i-J- inches; of 

 first intermediate, T 9 ^-; of second intermediate, T 8 ^; of 

 corner T 5 g-. Width of central incisors, ^-inches; of 

 first intermediate, y 5 ^; of second intermediate, T 8 ^; of 

 corner, T 8 g. ; distance between the first lower molar 

 and incisors, 4^ inches. 



The following formula represents the age at 

 which the teeth are up and in wear. They make their 

 first appearance at from six to nine months earlier. 



i, 2, 3, 4. i, 2, 3, 4, 5, 6. 



*Firstyear__T TTT TTTPOO 



Second year. P TTT TTTPPP 



Third year. _P PTT PPTPPP 



Fourth year. P PPT PPPPPP 



Fifth year__P PPP PPPPPP 



*These deductions were made from personal observation on the teeth of 

 a pure bred Holstein cow. 



