of the Animals of the Farm. 
429 
The Teeth of the Pig. 
When the dentition is perfect, the pig has six incisor teeth in 
the front of both upper and lower jaw — two central, two lateral, 
and two corner teeth. Behind the corner teeth are the tusks, one 
on each side, in the upper and lower jaws. Between the tusks 
and the molar teeth there are usually four small teeth which 
are described as premolars, then one on each side of both jaw, 
and twenty-four molars, six on each side of the upper and lower 
jaws. 
Temporary and permanent incisors agree generally in number, 
form, and position, but the temporary molars are only three 
in number on each side of the upper and lower jaws, and 
the third molar has three cusps instead of two. The tem- 
porary tusks are much smaller and more pointed than the 
permanent teeth which replace them, and the premolars are 
not represented by temporary teeth, but are permanent from 
the first. 
It may be observed that no difficulty is found by the expert 
in distinguishing the permanent incisors from the temporary 
organs, especially when both orders are in the mouth together. 
The distinction is not, however, so marked as to secure the 
tyro from risk of error. 
At birth the pig has two sharp-pointed teeth laterally placed 
in each jaw, top and bottom, leaving an open space in the 
front of the mouth (Fig. 42). The teeth much resemble small 
Fig. 4:2.— Teeth of Pig at hirih 
tusks ; they are really the temporary tusks and corner incisors. 
No other teeth are in the mouth at the time of birth ; but the 
temporary molars are immediately under the gum, and in the 
dried specimen they can be distinctly seen in their relative 
positions. 
At one month old the three temporary molars on each side 
of the jaw, top and bottom, are cut, the second and third in 
position being well up, the first one just appearing through the 
gum ; at the same time the two central temporary incisors in 
each jaw are cut, as shown in the illustration (Fig. 43). 
