as indicative of the Age of the Animal. 349 
incisors and that of the latter by the permanent tushes, are 
situated by the sides of the mouth, and consequently do not 
Fig. 45.* 
injure the nipple of the sow when grasped by the young animal 
in the act of sucking. In connexion with the position of these 
teeth is an interesting fact with regard to the tongue of the 
young pig. Most persons are aware that Avhen the pig lays hold 
of the nipjile, he is with some difficulty removed, and that even 
when the sow rises, the young creature will often be found hang- 
ing to the teat. This is partly explained by the circumstance 
that the tongue is fringed upon its border, and as, in the act of 
sucking, the organ is doubled along its middle, these fringes 
* Fig- "15. Permanent incisors of the pig, removed from their sockets, m m, 
the middle pair of the upper and lower jaw ; l l, the lateral, and c c the corner, 
VOL. XV. 2 A 
