Diseases of the Teeth. 229 



4. If chronic, becoming of the nature of pus, and 

 stinking, a catarrh, the bones of the head being affected. 



Acute discharges are seen in common colds, inflamma- 

 tion of the larynx, bronchitis, pneumonia and lung gan- 

 grene (rotting). 



Black teeth in pigs are generally removed, although so 

 far no data have been produced to prove that they have 

 an injurious effect on pigs. In very young pigs at a few 

 days old, the tushes should be broken off, thus avoiding 

 tearing or soreness of the sow's teats, a result of which 

 might be garget and loss of the sow and pigs. 



