156 



362. Incisors.— 5^^K/^^7; one yeav and nine months and two years and 

 three months, the two central incisors are replaced by permanent teeth ; 

 at tivo years and three months to two years and six months, the two middle 

 lateral incisors are cast, and the animal has four broad teeth ; at three 

 years old, six permanent teeth are seen ; and at about three years and 

 three months, the corner, or canine milk teeth are shed, and eight broad 

 teeth are in view. The permanent teeth are very much larger, and 

 darker than the milk teeth, which are very white, and are thus readily 

 distinguished. 



363. The following illustration shows at what age the incisor milk 

 teeth of cattle are cast and replaced by permanents : 



Permanent Incisors of the Cow. 



1. Centrals, i year 9 months to 2 years 3 months. 



2. Middle Laterals, 2 years 3 months to 2 years 6 months. 



3. Laterals, 2 years 6 months to three years. 



4. Corners, or Canines, 3 years to 3 years 3 months. 



364. The crowns, or wearing surfaces of the molar teeth of cattle 

 are very unlike those of the horse, having sharp elevations and 

 depressions, resembling the teeth of flesh-eating animals, and are well 

 suited for tearing down rough fibrous grass, but are not adapted for 

 grinding oats or other grain ; the cow being a true herbivorous animal. 



