DETERMINING THE AGE OF STOCK 



165 



Teeth of the cow at two years, a, ex- Teeth of the cow at two years, nine 

 ternal face; b, internal face. months, a, external face; b, in- 



ternal face. 



Teeth of the cow at three years, six 

 months, a, external face; b, in- 

 ternal face. 



Teeth of the cow at four years. 



