MODERN FEEDING OF PIGS. 
309 
tition, comparing both the old observations and the new. 
This method will prove that there is a remarkable difference 
in the time occupied by the teeth in cutting their way through 
the gum and appearing on its surface, while the mode of suc¬ 
cession remains unchanged. But it must be remembered that 
the dentition tables, still referred to in modern books for the 
practical pig breeder, are based upon observations made in 
times when the common pig was raised, or, perhaps, a breed 
more or less improved by English stock, and fed in the old 
fashioned style. Variations into early maturity were then 
described as abnormal; but as so6n as the pure breeding of 
the favorites of our day commenced, Berkshire, Poland China, 
et al ., and we applied to them scientific feeding, we forced the 
animals into entirely new and artificial conditions, revealing 
the hitherto unknown physiological laws of early maturity. 
The young pig comes into the world with eight teeth, I 3 
and C, that is the corner incisors next to the tusk, and the tusk 
itself. These teeth look very much alike, and evidently have 
the purpose of assisting the tongue in sucking. 
Between 4 and 14 days appear two milk molars, M 2 upper 
and M 3 lower jaw. From 2 to 5 weeks break through M 2 
lower and M 3 upper jaw, and at about the same time 1 1 upper 
and I 1 lower jaw. Between five weeks and three months ap¬ 
pear / 3 and I 2 lower jaw, followed shortly after by /2 upper. 
With this tooth the milk dentition is finished—the normal 
time being three months. The longer time mentioned in each 
case is the time at which the various teeth appear in the 
primitive hog, and the shorter time is that at which these teeth 
may appear in our improved hogs. 
The milk dentition is now resting for a time, seemingly 
to prepare for the growth of the permanent teeth. Between 
2 and 6 months the first permanent molar M 1 will appear, 
and together with it the wolfs tooth. The other teeth are 
replaced in the order in which they succeeded in the milk 
dentition. Thus we see / 3 and C, at y }4 to 10 months, fol¬ 
lowed shortly by M 2 upper and lower jaw. In about 12 
months, / 1 lower will appear, while / 1 upper jaw sometimes 
comes as late as 15 months. After changing the premolars, 
/ 1 and M 3 appear in from 11 to 22 months. Between 16 and 
