166 WESTERN GRAZING GROUNDS AND FOREST RANGES 



Chicago, in 1904, not as representing absolute accuracy, 

 but in the direction of giving the feeder the benefit of 

 the doubt: 



Twelve Months : An animal of this age shall have all 

 of its milk (calf) incisor teeth in place. 



Fifteen Months : At this age the center pair of incisor 

 milk teeth may be replaced by center pair of permanent 

 incisors (pinchers), the latter teeth being through the 

 gums but not yet in wear. 



Eighteen Months : The middle pair of permanent in- 

 cisors at this age should be fully up and in wear, but 

 next pair (first intermediate) not yet cut through gums. 



Twenty-four Months : The mouth at this age will 

 show two middle permanent (broad) incisors fully up 

 and in wear, and next pair (first intermediate) well up 

 but not in wear. 



Thirty Months : The mouth at this age may show six 

 broad permanent incisors, the middle and first interme- 

 diate pairs fully up and in wear and the next pair (sec- 

 ond intermediate) well up but not in wear. 



Thirty-six Months : Three pairs of broad teeth should 

 be fully up and in wear and the corner milk teeth may 

 be shed or shedding, with the corner permanent teeth 

 just appearing through gums. 



Thirty-nine Months : Three pairs of broad teeth will 

 be fully up and in wear and corner teeth (incisors) 

 through gums but not in wear. 



Horn Buttons. An unfailing method of determining 

 between two and three-year-old steers is by means of 

 the little button on the tip of the horns. This button or 

 rough place on the end of a two-year-old's horns is 

 simply the shedding off of the outside shell, and so long 



