of the Animals of the Farm. 425 
Fig. 35. — Molars of Lamh at three months. 
Fig. 36. — Molars of Sheei^ at nine months. 
A one-year-old sheep's teeth -will present the following ap- 
pearances. Incisors are worn on their upper surfaces, especially 
the central and middle teeth. In sheep which are feeding on 
turnips, some of the incisors, and in certain cases all of them, 
are broken off, and in very forward animals the central per- 
manent incisors are cut, but they are never perfectly level 
and regular at this age. In the drawing (Fig. 37, p. 426), the 
average state of the incisors in a well-preserved mouth at the 
age of one year is shown. 
Looking at the back of the mouth, the examiner will see the 
fifth permanent molar standing well out from the jaw, while the 
teeth in front of it are all worn on the surfaces ; these appear- 
ances, taken in connection with the state of the incisors, will 
enable him to assert that the sheep is about the age of one 
year. 
The first broad teeth, central incisors, are usually cut soon 
after one year old, and are well up at fifteen months as shown 
the next illustration (Fig. 38). 
At eighteen months the sixth permanent molar is cut, and the 
