FEATURES OF ANIMAL FORM 55 



its place at from three and a quarter to three and one half 

 years. 



Four years. The corner teeth are in and the mouth is 

 complete at from three years and nine months to four years 

 and six months. 



Five years. The pinchers have commenced to wear 

 level. 



Six years. The pinchers are leveled completely, 

 both pairs of intermediates partly and the corners some- 

 what. 



Seven years. The first intermediate pair is completely 

 leveled and the second pair is much worn. 



Eight years. The tables of all the teeth are leveled 

 and the pinchers begin to show a hollow which corresponds 

 to the prominence of the cushion of the upper jaw. This 

 concavity appears in the first intermediates at nine and 

 in the second at ten. 



There have taken place, meantime, alterations in the 

 appearance of the mouth similar to those described in 

 the horse. 



68. Telling the age by the horns. The growth of 

 the horn is a fairly reliable indication of the age in 

 cattle. The first distinct ring appears at three years, 

 and each succeeding year adds its ring so that two 

 should be added to the count of the rings to determine 

 the age. 



69. Determination of the age of sheep. The erup- 

 tion of the permanent pinchers takes place in the sheep 

 at from twelve to fifteen months of age and the suc- 

 ceeding two pairs of intermediates and corners follow 

 approximately one year apart. At least this is the 

 basis upon which the age of sheep is usually reckoned, 

 although the exact time of the eruption of the teeth 



