62 THE FARM DOCTOR. 



and especially should the waste of these places be forbidden 

 them. Such hog-pens, indeed all piggeries, should be kept 

 scrupulously clean and clear of rats and mice. The carcasses 

 of swine fed near slaughter-houses or where rats abound should 

 be subjected to a thorough microscopic examination before 

 passing into consumption. Whenever a case of trichinosis 

 occurs in a human subject the pork should be traced to its 

 source if possible, and the pigs reared in the same place killed 

 and subjected to prolonged boiling. The rats and mice should 

 be eradicated and the hog-pens and manure burned. 



