as indicative of the Age of the Animal. 
357 
face, of a well-marked ridge running parallel with tlicir long 
axis, and bounded on either side by a dcopish hollow. In the 
recenthj-cut incisor these hollows unite at the apex of the tooth, 
giving a pointed extremity to the ridge just described. It 
should be observed that these remarks apply especially to the 
lower jaw. If these particulars are borne in mind, the permanent 
incisors cannot possibly 
be confounded with the 
temporary. Most of them 
are rendered sufficiently 
apparent in the annexed 
engraving to prevent such 
a mistake. 
From the preceding 
remarks it is evident that 
a person, instead of judg- 
ing of the age of a pig 
from the size of the tush 
alone, must also consider 
the state of the incisor 
teeth, and particularly 
when he is examining an 
animal said to be a year 
old. The lower tushes are 
often at this time fully 
three quarters of an inch 
long ; but by themselves, 
these teeth possess hardly 
any value in determining 
the cjuestlon of age. In 
combination with the in- 
cisors they are of value, 
and the condition of both 
incisors and tushes must 
be taken together or not 
taken at all. From the 
corner permanent incisors 
being put up at nine 
months, and the middle 
at twelve, the pig will 
now have but two tempo- 
rary incisors, the lateral, 
in either jaw. Another 
* Fig. 53. Lo-H-er jaw of a pig fifteen months old, showing the increased length 
of the tushes and incisors, and the putting up of the three anterior permanent 
molars — I, 2, 3, m. 
