THE OX AND THE DAIRY. 13 



the two central permanent teeth shoot up, and push out the 

 mere relics of their predecessors. During this process, the 

 extremity, or alveolar margin of the jaw itself, is growing and 

 widening, so as to afford room for the development of the rest 

 of the teeth yet in their capsules ; and the increase of both 

 teeth and jaw goes on in according harmony. It is not until 

 towards the close of the second year that the next incisor on 

 each side takes the place of its temporary predecessor; nor 

 until the close of the third that the next in rotation succeed. 



THIRD YEAR. 



The corner milk-teeth, however, are now mere rudiments, 

 and they give place at the close of the fourth, or beginning of 



FOURTH YEAR. 



the fifth year, to their successors ; in all these changes some 

 allowance must be made for the vigour or the weakness of 

 the animal ; but such is the average routine. 



The last teeth obtained are smaller than the rest, and can 

 scarcely be said to be fully grown until a few months have 

 elapsed. The whole set is complete, but while the outer 



